5. Concatenating observations

A FOT contains data from one OP (Observing Period)
A FOT usually contain a single normal OP plus the preceding and following slew OPs if applicable.

In turn each OP can be divided in a number of finer time intervals called observations.

The names of observing period and observations used for SAX are mutuated from EXOSAT. The equivalent names for XMM have later been changed to observation and exposure, respectively.
Of course only observations in the same or compatible configuration can be concatenated together. Before proceeding to concatenation, one shall check the instrument configuration. The following procedure is recommended.

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