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Method
The program will work on files with up to seven dimensions.
The output array contains the mean of the input arrays. Each input
element may be weighted.
Weighting can either be by the reciprocal of the variance, a user
supplied value for each file (e.g. the total exposure time) or
the mean can be unweighted. If an input element has bad quality then
it will be ignored. An output element will be good unless none of the
corresponding input elements were good. An output element which has
been produced from fewer good pixels than its neighbours will be
apparent by its larger variance. An output variance array is only
produced if all the input files contain variance arrays. Quality
checking is only carried out if all files contain quality, otherwise
none of the files are quality checked and an output quality array is
not produced.
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