Subclass raw_GCxGC are contained in GCxGC super class. It contains a dedicated slot to storage the folded two-dimensional chromatogram.
chromatograma numeric matrix.
timea vector of two elements with the range of the first dimenstion run time
In the first creation of a raw_GCxGC object, the slot for the
chromatogram is not created yet. To read and fold the chromatogram
use the read_chrom function.