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Figure 5


Fig. 5. Histograms of polarization sensitivity values (PS). (A) UV receptors (R8 cells) with PS <2 (N=17); (B) colour receptors within rows 1, 2P, 3, 4 [PS=2.3±2 (s.d.), N=22]; (C) hemispheric receptors (ventral and dorsal hemispheres) with a `typical crustacean' design (PS=3.8±1.6, N=17); and (D) `high PS cells' within rows 2D, 5, 6 (PS=6.1±2, N=14). The PS of `high PS cells' is significantly higher than that of hemispheric receptors (t-test, P<0.005).





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