Image Reduction and Analysis Facility
PACKAGE = longslit
   TASK = background

input   = sn1987a_5173_flat2_trans.fits  Input images to be background subtracte
output  = sn1987a_5173_flat2_trans_skysub.fits  Output background subtracted ima
(axis   =                    2) Axis along which background is fit and subtracte
(interac=                  yes) Set fitting parameters interactively?
(sample =                    *) Sample of points to use in fit
(naverag=                    1) Number of points in sample averaging
(functio=             legendre) Fitting function
(order  =                    3) Order of fitting function
(low_rej=                   2.) Low rejection in sigma of fit
(high_re=                   1.) High rejection in sigma of fit
(niterat=                    1) Number of rejection iterations
(grow   =                   0.) Rejection growing radius
(graphic=             stdgraph) Graphics output device
(cursor =                     ) Graphics cursor input
(mode   =                   ql)