FLAIRCOMP-Compresses a FLAIR frame to give a weight vector.

Description:

This application takes a FLAIR frame stored in an NDF and compresses it along the y axis, normalises the compressed array by its mean value, and then finds the minima in the values and set these to the bad value. Thus it provides the weights for an optimal extraction. It reports the number of fibres found in the NDF.

This assumes stability (x positions of the fibres do not move), and vertical orientation of the fibres. These are satisfied by FLAIR (Parker, private communication).

Usage:

flaircomp in out

Parameters:

IN

The input two-dimensional NDF. This should be the co-added arc or sky flat-field frames, so that the compressed array gives the instrumental response of the detector system.

OUT

The vector of weights to use during optimal extraction.

TITLE

Value for the title of the output NDF. A null (!) propagates the title from input NDF to the output. [!]

Source comments:

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