The ANAL option permits one of a number of analytic functional forms
to be chosen for a psf, using the MASK parameter,
PSF definitions available GAUSSIAN - Gaussian response TRIANGLE - Triangular response TOPHAT - Circular top-hat FLAT_TRI - Triangle with flat top MASK - Name of profile to use (select from above) /'GAUSSIAN'/ >The default is always
GAUSSIAN. The spatial scale of the analytic
form is established using the AUX parameter. The nature of the
data required varies with the MASK choice,
Dataset pixels are 1 arcmin square ; User is informed of dataset
; pixel size.
AUX - Gaussian FWHM in arcmin /1/ > ; GAUSSIAN prompt
AUX - Tophat full width in arcmin > ; TOPHAT prompt
AUX - Triangle zero-point full ; TRIANGLE prompt
width in arcmin >
Please supply full-width at zero
response (FWZR) and full-width
half-max (FWHM)
AUX - FWZR and FWHM in arcmin > ; FLAT_TRI prompt
Note that in all the above cases the geometrical information is
supplied in terms of the axis units of the dataset if present
(pixels otherwise). These data are sufficient to define the
normalisation of the psf in each case, as the integrated total
is always unity.