GenericCamera¶

Note

This page is generated by python script generate_cet.py.

Commands¶

setFullFrame¶

EFDB_Topic:	GenericCamera_command_setFullFrame

ignored¶

IDL_Type:	boolean
Units:	unitless

Description: This value is ignored.

setROI¶

EFDB_Topic:	GenericCamera_command_setROI

topPixel¶

IDL_Type:	int
Units:	pixel

Description: This is the regions top most pixel number (base 0).

leftPixel¶

IDL_Type:	int
Units:	pixel

Description: This is the regions left most pixel number (base 0).

width¶

IDL_Type:	int
Units:	pixel

Description: This is the regions width in pixels.

height¶

IDL_Type:	int
Units:	pixel

Description: This is the regions height in pixels.

startLiveView¶

EFDB_Topic:	GenericCamera_command_startLiveView

expTime¶

IDL_Type:	double
Units:	second

Description: Exposure time.

stopLiveView¶

EFDB_Topic:	GenericCamera_command_stopLiveView

ignored¶

IDL_Type:	boolean
Units:	unitless

Description: This value is ignored.

takeImages¶

EFDB_Topic:	GenericCamera_command_takeImages

numImages¶

IDL_Type:	long
Units:	unitless

Description: Number of consecutive images to take

expTime¶

IDL_Type:	double
Units:	second

Description: Exposure time

shutter¶

IDL_Type:	boolean
Units:	unitless

Description: True if the shutter should be opened/closed

sensors¶

IDL_Type:	string
Units:	unitless

Description: Sensors to be read out, if blank all configured sensors will be read out

keyValueMap¶

IDL_Type:	string
Units:	unitless

Description: Map of additional key value pairs to associate extra data with the image(s), e.g. imageType: XYZ, groupId: ABC

obsNote¶

IDL_Type:	string
Units:	unitless

Description: An arbitrary operator provided string, useful for informally flagging images

abort¶

EFDB_Topic:	SALGeneric_command_abort

disable¶

Description: Transition from state Enabled to Disabled.

EFDB_Topic:	SALGeneric_command_disable

enable¶

Description: Transition from state Disabled to Enabled.

EFDB_Topic:	SALGeneric_command_enable

enterControl¶

Description: Transition from state Offline to Standby. Only that start in Offline state CSCs support this command; other CSCs start in Standby state and quit when they go to Offline.

EFDB_Topic:	SALGeneric_command_enterControl

exitControl¶

Description: Transition from state Standby to Offline. For CSCs that start in Standby state this makes the CSC quit. CSCs that start in Offline state, they remain active.

EFDB_Topic:	SALGeneric_command_exitControl

setAuthList¶

EFDB_Topic:	SALGeneric_command_setAuthList

authorizedUsers¶

IDL_Type:	string
Units:	unitless

Description: Comma seperated list of authorized users currently allowed to command this CSC,: in the form user@host. If the first character is +/- then the specified users are added/removed. Duplicates are silently ignored. The CSC’s own user@host is silently ignored, because it is always authorized. For removal, CSCs that are not in the list are silently ignored. Whitespace is allowed after the optional initial +/- and after each comma.

nonAuthorizedCSCs¶

IDL_Type:	string
Units:	unitless

Description: Comma seperated list of CSC’s not currently allowed to command this CSC,: in the form name[:index]. An index of 0 is stripped (name:0 becomes name). If the first character is +/- then the specified CSCs are added/removed. Duplicates are silently ignored. For removal, CSCs that are not in the list are silently ignored. Whitespace is allowed after the optional initial +/- and after each comma.

setLogLevel¶

Description: Set the logging level.

EFDB_Topic:	SALGeneric_command_setLogLevel

level¶

IDL_Type:	int
Units:	unitless

Description: Logging level, as a Python logging level: error=40, warning=30, info=20, debug=10.

setValue¶

EFDB_Topic:	SALGeneric_command_setValue

parametersAndValues¶

IDL_Type:	string
IDL_Size:	256
Units:	unitless

Description: List of parameters and their values as a Json string

standby¶

Description: Transition from state Offline, Disabled or Fault to Standby.

EFDB_Topic:	SALGeneric_command_standby

start¶

Description: Transition from state Standby to Disable, in a specified configuration.

EFDB_Topic:	SALGeneric_command_start

settingsToApply¶

IDL_Type:	string
IDL_Size:	256
Units:	unitless

Description: Name of the selected settings set

Events¶

calibrationDetailedState¶

EFDB_Topic:	GenericCamera_logevent_calibrationDetailedState

substate¶

IDL_Type:	long
Units:	unitless
Enumeration:	DISABLED,ENABLED,INTEGRATING

Description: Enumeration of valid substates

timestampTransition¶

IDL_Type:	double
Units:	second

Description: The time at which the state transition occurred

cameraInfo¶

EFDB_Topic:	GenericCamera_logevent_cameraInfo

cameraMakeAndModel¶

IDL_Type:	string
Units:	unitless

Description: This is the make and model of the current camera.

cameraSpecificProperty¶

EFDB_Topic:	GenericCamera_logevent_cameraSpecificProperty

propertyName¶

IDL_Type:	string
Units:	unitless

Description: This is the name of the property specific to this camera.

propertyValue¶

IDL_Type:	string
Units:	unitless

Description: This is the value of the property specific to this camera.

ccsCommandState¶

EFDB_Topic:	GenericCamera_logevent_ccsCommandState

substate¶

IDL_Type:	long
Units:	unitless
Enumeration:	IDLE,BUSY

Description: Substate of the CCS command.

timestampTransition¶

IDL_Type:	double
Units:	second

Description: The time at which the state transition occurred

ccsConfigured¶

EFDB_Topic:	GenericCamera_logevent_ccsConfigured

endIntegration¶

EFDB_Topic:	GenericCamera_logevent_endIntegration

ignored¶

IDL_Type:	boolean
Units:	unitless

Description: Attribute required by the SAL API, but is unused.

endLiveView¶

EFDB_Topic:	GenericCamera_logevent_endLiveView

ignored¶

IDL_Type:	boolean
Units:	unitless

Description: Attribute required by the SAL API, but is unused.

endOfImageTelemetry¶

Description: Event sent once all telemetry correesponding to the image has been sent. (Typically ~300mS after the end of readout).: Note: all : delimited strings (aka string arrays) follow the escaping convention defined in CAP-572

EFDB_Topic:	GenericCamera_logevent_endOfImageTelemetry

additionalKeys¶

IDL_Type:	string
Units:	unitless

Description: Additional keys passed to the takeImages command (: delimited)

additionalValues¶

IDL_Type:	string
Units:	unitless

Description: Additional values passed to the takeImages command (: delimited, in same order as additionalKeys)

imagesInSequence¶

IDL_Type:	long
Units:	unitless

Description: The total number of requested images in sequence

imageName¶

IDL_Type:	string
IDL_Size:	32
Units:	unitless

Description: The imageName for this specific exposure, assigned by the camera

imageIndex¶

IDL_Type:	long
Units:	unitless

Description: The zero based index number for this specific exposure within the sequence

imageSource¶

IDL_Type:	string
IDL_Size:	2
Units:	unitless

Description: The source component of the image name (AT/CC/MC)

imageController¶

IDL_Type:	string
Units:	unitless

Description: The controller for the image (O=OCS/C=CCS/…)

imageDate¶

IDL_Type:	string
IDL_Size:	8
Units:	unitless

Description: The date component of the image name (YYYYMMDD)

imageNumber¶

IDL_Type:	long
Units:	unitless

Description: The image number (SEQNO) component of the image name

timestampAcquisitionStart¶

IDL_Type:	double
Units:	second

Description: The effective time at which the image acquisition started (i.e. the end of the previous clear or readout)

exposureTime¶

IDL_Type:	double
Units:	second

Description: The requested exposure time

imageTag¶

IDL_Type:	string
IDL_Size:	64
Units:	unitless

Description: The DAQ assigned image tag (hex string)

timestampDateObs¶

IDL_Type:	double
Units:	second

Description: The observation date, as computed by CCS (as TAI)

timestampDateEnd¶

IDL_Type:	double
Units:	second

Description: The end observation date, as computed by CCS (as TAI)

measuredShutterOpenTime¶

IDL_Type:	double
Units:	second

Description: The measured shutter open time, as computed by CCS. This is a best estimate based on a summary of the full information provided: in the shutterBladeMotionProfile events.

darkTime¶

IDL_Type:	double
Units:	second

Description: The dark time, as computed by CCS

endReadout¶

Description: Event sent at end of readout. When this event is received the corresponding image should be complete: in the DAQ 2-day store. Note: all : delimited strings (aka string arrays) follow the escaping convention defined in CAP-572

EFDB_Topic:	GenericCamera_logevent_endReadout

additionalKeys¶

IDL_Type:	string
Units:	unitless

Description: Additional keys passed to the takeImages command (: delimited)

additionalValues¶

IDL_Type:	string
Units:	unitless

Description: Additional values passed to the takeImages command (: delimited, in same order as additionalKeys)

imagesInSequence¶

IDL_Type:	long
Units:	unitless

Description: The total number of requested images in sequence

imageName¶

IDL_Type:	string
IDL_Size:	32
Units:	unitless

Description: The imageName for this specific exposure, assigned by the camera

imageIndex¶

IDL_Type:	long
Units:	unitless

Description: The zero based index number for this specific exposure within the sequence

imageSource¶

IDL_Type:	string
IDL_Size:	2
Units:	unitless

Description: The source component of the image name (AT/CC/MC)

imageController¶

IDL_Type:	string
Units:	unitless

Description: The controller for the image (O=OCS/C=CCS/…)

imageDate¶

IDL_Type:	string
IDL_Size:	8
Units:	unitless

Description: The date component of the image name (YYYYMMDD)

imageNumber¶

IDL_Type:	long
Units:	unitless

Description: The image number (SEQNO) component of the image name

timestampAcquisitionStart¶

IDL_Type:	double
Units:	second

Description: The effective time at which the image acquisition started (i.e. the end of the previous clear or readout)

requestedExposureTime¶

IDL_Type:	double
Units:	second

Description: The requested exposure time (as specified in the takeImages command)

timestampEndOfReadout¶

IDL_Type:	double
Units:	second

Description: The time at which the readout was completed

endShutterClose¶

EFDB_Topic:	GenericCamera_logevent_endShutterClose

endShutterOpen¶

EFDB_Topic:	GenericCamera_logevent_endShutterOpen

endTakeImage¶

EFDB_Topic:	GenericCamera_logevent_endTakeImage

fileCommandExecution¶

Description: Each time a command is executed on a single FITS file this event is generated

EFDB_Topic:	GenericCamera_logevent_fileCommandExecution

imageName¶

IDL_Type:	string
IDL_Size:	32
Units:	unitless

Description: The imageName for this specific exposure, assigned by the camera

timestampCommandComplete¶

IDL_Type:	double
Units:	second

Description: The time when the command completed.

command¶

IDL_Type:	string
Units:	unitless

Description: The comamnd executed included arguments.

rc¶

IDL_Type:	int
Units:	unitless

Description: The return code from the command execution.

fitsFilesWritten¶

Description: When this event is received, all of the CCS files on the diagnostic cluster have been written: Note: all : delimited strings (aka string arrays) follow the escaping convention defined in CAP-572

EFDB_Topic:	GenericCamera_logevent_fitsFilesWritten

imageName¶

IDL_Type:	string
IDL_Size:	32
Units:	unitless

Description: The imageName for this specific exposure, assigned by the camera

timestampFilesWritten¶

IDL_Type:	double
Units:	second

Description: The time when the (last) CCS FITS file was written.

rootFileName¶

IDL_Type:	string
Units:	unitless

Description: The common filesystem location of all files below.

relativeFileNames¶

IDL_Type:	string
Units:	unitless

Description: The file system location of each file, relative to rootFileName (: delimited).

fileNode¶

IDL_Type:	string
Units:	unitless

Description: The node on which each file is written (: delimited, in same order as above).

imageReadinessDetailedState¶

EFDB_Topic:	GenericCamera_logevent_imageReadinessDetailedState

substate¶

IDL_Type:	long
Units:	unitless
Enumeration:	READY,NOT_READY,GETTING_READY

Description: Enumeration of valid substates

timestampTransition¶

IDL_Type:	double
Units:	second

Description: The time at which the state transition occurred

imageStored¶

Description: When this event is received the corresponding image should be complete in the DAQ 2-day store.: Once in use this will allow endReadout event to go back to indicating that the readout is complete (sequencers finished). Note: all : delimited strings (aka string arrays) follow the escaping convention defined in CAP-572

EFDB_Topic:	GenericCamera_logevent_imageStored

imageName¶

IDL_Type:	string
IDL_Size:	32
Units:	unitless

Description: The imageName for this specific exposure, assigned by the camera

timestampImageStored¶

IDL_Type:	double
Units:	second

Description: The time when the DAQ image was store was complete.

imageVisualization¶

Description: Event sent when image visualization is ready

EFDB_Topic:	GenericCamera_logevent_imageVisualization

imageName¶

IDL_Type:	string
IDL_Size:	32
Units:	unitless

Description: The imageName for this specific exposure, assigned by the camera

timestampVisualizationAvailable¶

IDL_Type:	double
Units:	second

Description: The time when the command completed.

url¶

IDL_Type:	string
Units:	unitless

Description: The URL at which the full image visualization is available.

thumbnail¶

IDL_Type:	string
Units:	unitless

Description: The URL at which the image thumbnail is available.

notReadyToTakeImage¶

EFDB_Topic:	GenericCamera_logevent_notReadyToTakeImage

offlineDetailedState¶

EFDB_Topic:	GenericCamera_logevent_offlineDetailedState

substate¶

IDL_Type:	long
Units:	unitless
Enumeration:	OFFLINE_AVAILABLE,OFFLINE_PUBLISH_ONLY

Description: Enumeration of valid substates

timestampTransition¶

IDL_Type:	double
Units:	second

Description: The time at which the state transition occurred

prepareToTakeImage¶

EFDB_Topic:	GenericCamera_logevent_prepareToTakeImage

readyToTakeImage¶

EFDB_Topic:	GenericCamera_logevent_readyToTakeImage

roi¶

EFDB_Topic:	GenericCamera_logevent_roi

topPixel¶

IDL_Type:	int
Units:	pixel

Description: This is the regions top most pixel number (base 0).

leftPixel¶

IDL_Type:	int
Units:	pixel

Description: This is the regions left most pixel number (base 0).

width¶

IDL_Type:	int
Units:	pixel

Description: This is the regions width in pixels.

height¶

IDL_Type:	int
Units:	pixel

Description: This is the regions height in pixels.

shutterDetailedState¶

EFDB_Topic:	GenericCamera_logevent_shutterDetailedState

substate¶

IDL_Type:	long
Units:	unitless
Enumeration:	CLOSED,OPEN,CLOSING,OPENING

Description: Enumeration of valid substates

timestampTransition¶

IDL_Type:	double
Units:	second

Description: The time at which the state transition occurred

startIntegration¶

Description: Event sent at start of image integration.: Note: all : delimited strings (aka string arrays) follow the escaping convention defined in CAP-572

EFDB_Topic:	GenericCamera_logevent_startIntegration

additionalKeys¶

IDL_Type:	string
Units:	unitless

Description: Additional keys passed to the takeImages command (: delimited)

additionalValues¶

IDL_Type:	string
Units:	unitless

Description: Additional values passed to the takeImages command (: delimited, in same order as additionalKeys)

imagesInSequence¶

IDL_Type:	long
Units:	unitless

Description: The total number of requested images in sequence

imageName¶

IDL_Type:	string
IDL_Size:	32
Units:	unitless

Description: The imageName for this specific exposure, assigned by the camera

imageIndex¶

IDL_Type:	long
Units:	unitless

Description: The zero based index number for this specific exposure within the sequence

imageSource¶

IDL_Type:	string
IDL_Size:	2
Units:	unitless

Description: The source component of the image name (AT/CC/MC)

imageController¶

IDL_Type:	string
Units:	unitless

Description: The controller for the image (O=OCS/C=CCS/…)

imageDate¶

IDL_Type:	string
IDL_Size:	8
Units:	unitless

Description: The date component of the image name (YYYYMMDD)

imageNumber¶

IDL_Type:	long
Units:	unitless

Description: The image number (SEQNO) component of the image name

timestampAcquisitionStart¶

IDL_Type:	double
Units:	second

Description: The effective time at which the image acquisition started (i.e. the end of the previous clear or readout)

exposureTime¶

IDL_Type:	double
Units:	second

Description: The requested exposure time

startLiveView¶

EFDB_Topic:	GenericCamera_logevent_startLiveView

ip¶

IDL_Type:	string
Units:	unitless

Description: This is the ip address for the live view data.

port¶

IDL_Type:	int
Units:	unitless

Description: This is the TCP port for the live view data.

startReadout¶

Description: Event sent at start of readout.: Note: all : delimited strings (aka string arrays) follow the escaping convention defined in CAP-572

EFDB_Topic:	GenericCamera_logevent_startReadout

additionalKeys¶

IDL_Type:	string
Units:	unitless

Description: Additional keys passed to the takeImages command (: delimited)

additionalValues¶

IDL_Type:	string
Units:	unitless

Description: Additional values passed to the takeImages command (: delimited, in same order as additionalKeys)

imagesInSequence¶

IDL_Type:	long
Units:	unitless

Description: The total number of requested images in sequence

imageName¶

IDL_Type:	string
IDL_Size:	32
Units:	unitless

Description: The imageName for this specific exposure, assigned by the camera

imageIndex¶

IDL_Type:	long
Units:	unitless

Description: The zero based index number for this specific exposure within the sequence

imageSource¶

IDL_Type:	string
IDL_Size:	2
Units:	unitless

Description: The source component of the image name (AT/CC/MC)

imageController¶

IDL_Type:	string
Units:	unitless

Description: The controller for the image (O=OCS/C=CCS/…)

imageDate¶

IDL_Type:	string
IDL_Size:	8
Units:	unitless

Description: The date component of the image name (YYYYMMDD)

imageNumber¶

IDL_Type:	long
Units:	unitless

Description: The image number (SEQNO) component of the image name

timestampAcquisitionStart¶

IDL_Type:	double
Units:	second

Description: The effective time at which the image acquisition started (i.e. the end of the previous clear or readout)

exposureTime¶

IDL_Type:	double
Units:	second

Description: The requested exposure time

timestampStartOfReadout¶

IDL_Type:	double
Units:	second

Description: The time at which the readout was triggered

startShutterClose¶

EFDB_Topic:	GenericCamera_logevent_startShutterClose

startShutterOpen¶

EFDB_Topic:	GenericCamera_logevent_startShutterOpen

startTakeImage¶

EFDB_Topic:	GenericCamera_logevent_startTakeImage

appliedSettingsMatchStart¶

EFDB_Topic:	SALGeneric_logevent_appliedSettingsMatchStart

appliedSettingsMatchStartIsTrue¶

IDL_Type:	boolean
Units:	unitless

Description: True when the configuration matches the start conditions

authList¶

EFDB_Topic:	SALGeneric_logevent_authList

authorizedUsers¶

IDL_Type:	string
Units:	unitless

Description: Comma seperated list of authorized users currently allowed to command this CSC.

nonAuthorizedCSCs¶

IDL_Type:	string
Units:	unitless

Description: Comma seperated list of CSC’s not currently allowed to command this CSC.

errorCode¶

Description: Output when a CSC goes into the Fault state as an explanation of the problem.

EFDB_Topic:	SALGeneric_logevent_errorCode

errorCode¶

IDL_Type:	long
Units:	unitless

Description: A numeric error code

errorReport¶

IDL_Type:	string
Units:	unitless

Description: An string providing detailed information about the error

traceback¶

IDL_Type:	string
Units:	unitless

Description: An optional stack trace of the error condition

heartbeat¶

EFDB_Topic:	SALGeneric_logevent_heartbeat

heartbeat¶

IDL_Type:	boolean
Units:	unitless

Description: Beats the drum.

logLevel¶

Description: Current logging level.

EFDB_Topic:	SALGeneric_logevent_logLevel

level¶

IDL_Type:	int
Units:	unitless

Description: Current logging level, a Python logging level: error=40, warning=30, info=20, debug=10.

logMessage¶

Description: A log message.

EFDB_Topic:	SALGeneric_logevent_logMessage

name¶

IDL_Type:	string
Units:	unitless

Description: Log name.

level¶

IDL_Type:	int
Units:	unitless

Description: Message level, a Python logging level: error=40, warning=30, info=20, debug=10.

message¶

IDL_Type:	string
Units:	unitless

Description: Log message.

traceback¶

IDL_Type:	string
Units:	unitless

Description: Exception traceback; “” if not an exception.

filePath¶

IDL_Type:	string
Units:	unitless

Description: Path to source file.

functionName¶

IDL_Type:	string
Units:	unitless

Description: Function or method name.

lineNumber¶

IDL_Type:	long
Units:	unitless

Description: Line number in the file specified by filePath.

process¶

IDL_Type:	long
Units:	unitless

Description: Process ID.

settingVersions¶

Description: Information about settings which can be specified in the start command.

EFDB_Topic:	SALGeneric_logevent_settingVersions

recommendedSettingsVersion¶

IDL_Type:	string
Units:	unitless

Description: List of comma seperated recomended versions of settings sets

recommendedSettingsLabels¶

IDL_Type:	string
Units:	unitless

Description: List of comma seperated names of settings sets

settingsUrl¶

IDL_Type:	string
Units:	unitless

Description: The URL where the settings sets definitions can be found

settingsApplied¶

Description: Base settings applied.

EFDB_Topic:	SALGeneric_logevent_settingsApplied

settingsVersion¶

IDL_Type:	string
IDL_Size:	256
Units:	unitless

Description: The SHA or name corresponding to the published configuration

otherSettingsEvents¶

IDL_Type:	string
Units:	unitless

Description: A comma delimited list of other specific CSC configuration events. This may be blank if no other CSC specific events are necessary

simulationMode¶

Description: Current simulation mode.

EFDB_Topic:	SALGeneric_logevent_simulationMode

mode¶

IDL_Type:	int
Units:	unitless

Description: Current simulation mode; 0 for normal operation (no simulation); other supported values are specific to each CSC.

softwareVersions¶

Description: Current versions of software in use by CSC.

EFDB_Topic:	SALGeneric_logevent_softwareVersions

salVersion¶

IDL_Type:	string
IDL_Size:	256
Units:	unitless

Description: This is the current version of SAL generation

xmlVersion¶

IDL_Type:	string
IDL_Size:	256
Units:	unitless

Description: This is the current version of CSC XML

openSpliceVersion¶

IDL_Type:	string
IDL_Size:	256
Units:	unitless

Description: This is the current version of OpenSplice

cscVersion¶

IDL_Type:	string
IDL_Size:	256
Units:	unitless

Description: This is the top-level version of the CSC

subsystemVersions¶

IDL_Type:	string
Units:	unitless

Description: A comma delimited list of key=value pairs relating subsystem name (key) to its version number (value). This may be left blank if there are no subsystems within a CSC

summaryState¶

Description: Current summary state of the CSC

EFDB_Topic:	SALGeneric_logevent_summaryState

summaryState¶

IDL_Type:	long
Units:	unitless

Description: High level state machine state identifier

Telemetry¶

temperature¶

EFDB_Topic:	GenericCamera_temperature

temperature¶

IDL_Type:	double
Units:	Celsius

Description: The temperature of the camera in degrees Celsius.

Navigation

GenericCamera¶

Commands¶

setFullFrame¶

ignored¶

setROI¶

topPixel¶

leftPixel¶

width¶

height¶

startLiveView¶

expTime¶

stopLiveView¶

ignored¶

takeImages¶

numImages¶

expTime¶

shutter¶

sensors¶

keyValueMap¶

obsNote¶

abort¶

disable¶

enable¶

enterControl¶

exitControl¶

setAuthList¶

authorizedUsers¶

nonAuthorizedCSCs¶

setLogLevel¶

level¶

setValue¶

parametersAndValues¶

standby¶

start¶

settingsToApply¶

Events¶

calibrationDetailedState¶

substate¶

timestampTransition¶

cameraInfo¶

cameraMakeAndModel¶

cameraSpecificProperty¶

propertyName¶

propertyValue¶

ccsCommandState¶

substate¶

timestampTransition¶

ccsConfigured¶

endIntegration¶

ignored¶

endLiveView¶

ignored¶

endOfImageTelemetry¶

additionalKeys¶

additionalValues¶

imagesInSequence¶

imageName¶

imageIndex¶

imageSource¶

imageController¶

imageDate¶

imageNumber¶

timestampAcquisitionStart¶

exposureTime¶

imageTag¶

timestampDateObs¶

timestampDateEnd¶

measuredShutterOpenTime¶

darkTime¶

endReadout¶

additionalKeys¶

additionalValues¶

imagesInSequence¶

imageName¶

imageIndex¶

imageSource¶

imageController¶

imageDate¶

imageNumber¶