On Thursday 23 August 2007 23:15, Randall Thompson wrote:
Although not a
reserved keyword, NEXTEND is commonly used to describe the
number of included extensions
There is a danger in explicit references to either the number of
extensions and individual ones. It is trivial to remove or add
extensions to FITS files. With explicit references in the primary
header, one would need to parse and correct it to maintain valid
header information.

Preben