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Fig. 4. Relationship between body mass and water content in 29 Drosophila species. Open symbols, males; filled symbols, females. Circles, mesic species; triangles, desert species. The regression line for the combined data from both sexes is W=0.0418+0.6305M; r2=0.986, P=4.74x10-53, where W is water content and M is body mass.