Table 2.

R² values for plots of five x, y data points, where y deviates from x as a percentage or a fixed amount of gray values (GVs)

Deviation	R2
±20%a	0.9245
±10%	0.9777
±5%	0.9940
±1%	0.9997
±500 GVa	0.8929
±250 GV	0.9709
±100 GV	0.9952
±20 GV	0.9998

All R² values are statistically significant (p < 0.01). The data points used for these tables were determined for the purpose of illustration, that is, they are not the result of experimentation.

^aIllustrated in Figure 1.