Computer calculations show the progressive changes in the individual elution band profiles of the components of a binary mixture during their migration and progressive separation along a chromatographic column. These changes are conveniently illustrated by the waveform surface, obtained by plotting the concentration of each component versus the column distance and time. The surface can be represented either in false 3-D views or by a contour map. Illustrated by the representations of the waveforms surface are the main features of the bank interaction, the progressive erosion of the rectangular injection band plateau, the formation and collapse of a front plateau for the first component band, the slower formation of a plateau at the rear of the second component band, and its decay after the bands have separated.