Table 1.

Linear regression parameters inferred. The intercept is the origin point in all cases. All P-values < 0.001.

DATASET	CALIBRATION POINT	SLOPE	R-SQUARED
Simulated asymmetrical	Shallow	0.212	1.0
	Median	0.048	0.88
	Deep	0.064	0.88
Simulated symmetrical	Shallow	0.208	1.0
	Median	0.049	0.95
	Deep	0.033	0.87
Empirical assymetrical	Shallow	0.312	0.99
	Median	0.183	0.99
	Deep	0.091	0.83
Empirical symmetrical	Shallow	0.240	0.99
	Median	0.163	0.99
	Deep	0.076	0.93