XMM-Newton Science Analysis System


cal (cal-3.236.3) [xmmsas_20160201_1833-15.0.0]

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Environmental dependencies

The calibration algorithms in the CAL are driven by data in the Current Calibration File (CCF). 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, file name etc.

Access to the CIF and the CCF constituents can be controlled via the following environment variables:

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.