Subclass aligned_GCxGC are contained in raw_GCxGC super class. It is not contained in the prepec_GCxGC due to raw chromatograms can be aligned without a previous preproccesing technique. Although, it can improve the performance of the aligment, but it is not mandatory.
You can perform the aligment after some preprocessing technique as: baseline correction, or signal smoothing to imporve the performance of the alignment function.
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