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XMM-Newton Science Analysis System Page: 1
The XMM Calibration Access Layer library
July 1, 2008
Abstract
CAL: Access to Calibration Data in the XMM CCF
1 Introduction
The Calibration Access Layer CAL is a subroutine library in the XMM Science Analysis System (SAS).
The purpose of the CAL is twofold:
 give SAS task access to basic calibration data in the XMM Current Calibration File (CCF)
(see Interface Control Document for the Current Calibration File[1])
 apply dedicated calibration algorithms to uncalibrated science data
2 Requirements
The CAL requires that a complete XMM CCF is accessible on the le system the SAS is being run on.
The CCF needs to reside in a single directory the name of which must be specied via an environment
variable or a task parameter on the command line (see Sect. 3.1 for details).
3 User-visible functionality
None.
3.1 Environmental dependencies
The calibration algorithms in the CAL are driven by data in the Current Calibration File (CCF)[1]. A
CCF is represented by the contents of a Calibration Index File (CIF) which comprises for each constituent
various entries such as the start validity date, issue number, le name etc.
Access to the CIF and the CCF constituents can be controlled via the following environment variables:
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SAS CCF The name of a data set containing a table with the name CALINDEX. This will normally be a
CIF created by the task cifbuild. SAS CCF can also be given the name of a directory which
is then supposed to contain a CIF with the default name ccf.cif.
SAS CCFFILES A white-space separated list of CCF constituents which should replace the corresponding
ones listed in the active CIF.
SAS CCFPATH A colon separated list of directories which constitutes a search path for CCF constituents.
Each of these variables has a corresponding command line option that is automatically available to all
tasks making use of the CAL. A given value on the command line supersedes any assignments made to
the corresponding environment variable. For more information on this and the names of the command
line options, please consult the documentation of package taskmain.
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References
[1] ESA. Interface control document for the XMM current calibration le. Technical Report XMM-GEN-
ICD-0005, ESA/SSD, Dec 2001. Issue 4.0.
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