XMM-Newton Science Analysis System


ssclib (ssclib-4.30) [xmmsas_20160201_1833-15.0.0]

Meta Index / Home Page / DSS utilities

Routines which deal with DSS GTI filters

GTIs are contained in structures of type IntervalT, which is defined in the module caltypes. This is similar to RangeT except that no type is given for the upper and lower bounds. Where I have translated GTIs into ranges (see for example section 9.6.3) I have taken the lower GTI bound to be INCLUSIVE and the upper to be EXCLUSIVE. A well-formed sequence of GTIs (of size N) should therefore obey the following criteria:

• For each GTI in the sequence, the upper bound value must exceed the lower bound value.

• For all i from 1 to N-1, the upper bound of GTI i must be less than the lower bound of GTI i+1.

There are currently no routines to test or correct the format of non-well-formed sequences of GTIs.

See also section 17.