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Fig. 5. Plots of D-values (degree of dependence of marginal values of
X and Y) derived by applying the rotation method to scaling
of gestation periods for a large sample of placental mammal species. Rotation
of the data in rads is indicated on the abscissa. (A) For the entire sample
(N=429), a global minimum (thick vertical line) is located at 0.255
rads, corresponding to 
=0.260. However, a local minimum value (thin
vertical line) is located at about 0.15 rads, corresponding to =0.151.
(B) For altricial mammals taken alone (N=227), there is a clear
single global minimum located at 0.174 rads, corresponding to =0.176.
(C) For precocial mammals taken alone (N=202), there is a clear
single global minimum located at 0.132 rads, corresponding to
=0.133.
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