DIFFERENCE_STATS - Calculates statistics for Michelle darks in a pairwise manner

Description:

This recipe is meant to be used in an array tests suite. It takes a group of observations, subtracts successive pairs, then calculates and reports the standard deviation for each resulting differenced frame in a central 200-pixel-square region, and in the four channels of the detector. It finally provides the average of these statistics for the group as a whole.

Notes:

• The frames must be in the same group.

Configurable Steering Parameters:

NUMBER = INTEGER

The number of frames in the group. The default is used if the number of frames is fewer than 2 or is not even. [20]

Implementation Status:

• The processing engines are from the Starlink package KAPPA.

• Uses the Starlink NDF format.