Table 1.

Linear regressions relating log(fractional image area) to log(mass, g)

	Intercept	Slope	r2	P
Head
Tracheae	−0.284±0.028	0.128±0.050	0.32	0.021
Air sacs	−0.598±0.174	0.498±0.105	0.16	0.005
Thorax
Tracheae	−0.221±0.025	0.067±0.029	0.28	0.037
Air sacs	−0.048±0.108	0.330±0.123	0.34	0.018
Abdomen
Tracheae	−0.209±0.021	0.088±0024	0.48	0.003
Air sacs	−0.223±0.127	1.068±0.156	0.77	0.001

Values are means ± SE, n = 16–18. For all regressions, slopes were significantly different from zero.