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Fig. 4. Influence of artificial sky temperature (TASK) on the
temperature of the external surfaces of the skin (TSIW),
insulation plumage (TPIW) and flight plumage
(TPFW) according to air temperature
(TAIR; 15°C in A,C,E, 25°C in B,D,F) and wind
speed (UWIN; 0.3 m s-1 in A,B; 11 m
s-1 in C,D; 20 m s-1 in E,F) during experimental phases
3 and 4. Dotted lines show observed mean values (N=4) while solid
lines show values predicted from the regression models based on all
measurements (Table 1).