PFI_LOC will display the SXT PFI location. There are two modes which
can be used when calling PFI_LOC. If the first parameter is a
date and time string, it will read the observing log and make a simple plot showing the
location relative to the sun's limbs. If the first parameter is an
SXT index, then it assumes that you have displayed this full frame image,
and it reads the observing log and puts a box on the image where the
PFI is located. Some sample calls are:
IDL> pfi_loc, '23-jun-93 1:00'
IDL> pfi_loc, timstr, hours=2
IDL> pfi_loc, index
IDL> pfi_loc, index, pfi_struct=sxtp
IDL> pfi_loc, index, '6-nov-93 3:30'
IDL> pfi_loc, index, '6-nov-93 3:30', /hour
It is possible to use the hours keyword option to specify the
number of hours plus and minus the full frame time for which you wish to
have PFI locations displayed. The pfi_struct option exists so
that you can pass a PFI roadmap or index structure directly to the
PFI_LOC to be displayed over the image. If a second positional parameter
is passed, the routine will get the PFI locations for that time and
overlay them on the image.
When using STEPPER, the ``o'' option will call PFI_LOC automatically for you, taking into account any rebinning which has been performed on the image.