Function uniqToIndex( uniq )

Description:

Extracts the HEALPix pixel index from a UNIQ-encoded integer as used in MOC encoding.

If the supplied value is not a legal UNIQ integer, -1 is returned.

Parameters:

uniq (long integer)

uniq-encoded value

Return Value (long integer):

pixel index

Signature:

long uniqToIndex(long)