XMM-Newton Science Analysis System
tabgtigen (tabgtigen-2.12.3) [xmmsas_20050815_1803-6.5.0]
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The purpose of tabgtigen
is to produce Good Time Intervals (GTIs) for
data processing based on the time history of the housekeeping and
other periodic data. The user specifies what data files to use and
what filtering criteria to use. The filtering criteria take the form
of a boolean expression, with table column names
being used as the variables in the expression. If for a given
row in a data set the boolean expression evaluates to true, then the
time for this row is included in the determination of the GTIs. The
output consists of one GTI file. The GTI list will be valid only for
those ranges of time covered by all input data files.
For a description of the syntax rules the boolean selection expression
must adhere to, please consult the documentation of the
SAS package selectlib.
Please note: Many of the available operators and functions
which can be used in the selection expression have merely limited
applicability in the case of tabgtigen
(e.g. region selection filters).
This functionality, however, is available ``for free'' since it
comes from the selectlib
package which tabgtigen
is based on.
XMM-Newton SOC/SSC -- 2005-08-15