NAME
instrument data file (IDF), default name suffix .ins.
DESCRIPTION
The instrument data file (IDF) is the resultfile of instrument. It stores a
description of some Wide Field Camera properties and contains references to
other calibration datafiles. Amongst these is the name of the mask file and
the appropriate detector file.
IDF FITS structure
ext.name type dim description
PRIMARY --- 0 keyword data only.
mask pattern, binned to match detector pixelsize,
WFCbinmask-32 nx ny first plane computed with open maskelement set to 1,
2
closed element to 0, second plane vice versa.
WFCdftmask-32 nx ny discrete Fourier transform of the original mask
2 pattern, planes differing as above.
first plane : for each pixel in the sky, the
reciprocal of the total detector area (cm2) seen
WFCcf -32 nx ny through open maskelements.
2 second plane: for each pixel in the sky, the
reciprocal of the area (not) seen through closed
maskelements.