These routines allow a user to print information on the partial-frame
and full-frame observing sequence being used. There are four possible
sequences for PFI and four more for FFI. Which sequence is used is
determined by the DP mode and telemetry rate. If the SXT index for
an image is passed, then it will figure out which of the four sequences was
running at that time.
IDL> print, gtab_ffi(index)
IDL> print, gtab_pfi('15-nov-91', 2)
If a time is passed, it will default to show
sequence number 0. It is possible to specify which sequence table by passing
it as a second parameter.