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In this document we fully described the current status of the ACCUMULATE and AVERAGE commands of CLASS, applied on spectra. They are very often used, and for different purposes, e.g. averaging a set of spectra or concatenating them. User must be warned about several traps that he may encounter:

As a solution to the first problem, the question of saving a weight array (one weight per channel) in the CLASS data format has been raised. This would have consequences in particular in term of disk storage.

Gildas manager 2014-07-01