. M 2700 3456 Fig*. 5. BImodal csurve of variability oC chrdmatio-rod length for taasa 21. 40 35 30 25 20 15 10 5 m 4 2 2 0 2 3:0 8 2 4 3 3 4 5 6 Fig. 6. BImodal carve o ? vnriabil ity of chromatic-rod 1 ^ngt h Zo r \m sa 2r.

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