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Fig. 13. Flight muscle efficiency during normal (
norm; open symbol)
and maximal hovering flight (
max; filled symbols) vs
body mass (Mb) for Xylocopa varipuncta females.
Assumed drag coefficient (CD)=1 (bottom panel) and 3 (top
panel). Model II regression for CD=1:
norm=3.44+33.28Mb,
r21=0.59, P<0.005 (broken line);
max=6.76+33.12Mb,
r20=0.70, P<0.001 (solid line). Model II
regression for CD=3:
norm=48.34+123.23Mb,
r21=0.28, P=0.20;
max=53.73+117.15Mb,
r20=0.39, P=0.07.