Cumulative distribution for LPVs with only one period identified for the sequences in Fig. 25. Each line represents a sequence, which are, from the most populated (top line at [3.6] = 16.5 mag) to the least populated (bottom line at [3.6] = 16.5 mag): Seq. E, Seq. C, Seq. C′, Seq. D, Seq. B, Seq. A.