Historical status
Keywords: class-single-multiple

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Historical status

In the original CLASS file format, any observation could have different versions. When writing an observation to a CLASS file, the algorithm had to reread the observations and all their versions already written and check if a previous version of the same observation was already present. If yes, the version number was increased. This is typically a algorithm. On latest modern computer, this started becoming a limiting factor (compared to the OS/hardware incompressible time) when writing more than spectra per file (see section ).