Just a few general remarks, given that Harald's questions have been
answered.
Most KAPPA NDF-manipulation commands will operate on arbitrary
dimensionality data (up to a maximum of seven dimensions), or at least
apply the same operation to all planes of a cube. DISPLAY is
for viewing images, hence the maximum number of dimensions is two.
The WFPC2 was built before the IMAGE extension was added to the FITS
standard. These days such data would tend to be in the form of
multi-extension FITS---a format that FITS2NDF could output to multiple
NDFs in one invocation. Storing related but different images in a cube
was for convenience, although I regard it as bad practice. For example,
the tessarae of a mosaic camera have different sky co-ordinates for each
plane as interpreted by a general FITS reader. Worse still are cubes
where each plane measures a different quantity.
Malcolm Currie
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