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Fig. 3. The average `difference waveform' of emergence rhythm of the early
and late populations
[(earlycontrol)/control] and
[(latecontrol)/control] were assayed under a
12:12 h LD cycle at the 5th, 10th, 25th, 40th and 55th generations (Gen.). The
`difference waveforms' were estimated by first subtracting the average
emergence waveforms of the early and late populations from
the controls and then scaling it by the average waveform of the
controls. The filled and empty bars denote the dark
(20:0008:00 h) and the light (08:0020:00 h) phases of the LD
cycle and Zeitgeber Time 0 (ZT0) denotes the time at which lights came on.