FTS1_AXIS

Creates an axis structure within an NDF from FITS header information

Description:

The routine searches the FITSD header for the keywords that describe the axis structure. If at least one reference value, CRVALn, exists then an axis component is created and filled with the appropriate values. CDELTn defines the step between axis values. If it is not present in the header it is set to 1. CRPIXn defines the reference pixel to which the reference value corresponds. If is absent form the header pixel 1 is assumed to be the reference pixel. If CTYPEn is in the header it is used to assigned a value to the nth axis’ s label component.

The precision of the output axis-centre array depends on the absolute relative size of the offset to the scale. Single precision is used if this ratio is greater than one hundred times the floating-point precision.

Invocation

CALL FTS1_AXIS( NCARD, HEADER, SCARD, NDF, STATUS )

Arguments

NCARD = INTEGER (Given)
The number of card images in the buffer.
HEADER( NCARD ) = CHARACTER ∗ 80 (Given)
The FITS header ’ cards’ , each element corresponding to a 80-character card.
SCARD = INTEGER (Given)
The number of the card from where the search will begin. This is needed because the headers make contain a dummy header prior to an extension.
NDF = INTEGER (Given)
The identifier for the NDF to contain the axis structure.
STATUS = INTEGER (Given and Returned)
The global status.