=+A measure of the accuracy of the automatic region is the average linear displacement (ALD). The paper gave the following ALD observations for a sample of 49 kidneys (units of pixel dimensions).

1.38 0.44 1.09 0.75 0.66 1.28 0.51 0.39 0.70 0.46 0.54 0.83 0.58 0.64 1.30 0.57 0.43 0.62 1.00 1.05 0.82 1.10 0.65 0.99 0.56 0.56 0.64 0.45 0.82 1.06 0.41 0.58 0.66 0.54 0.83 0.59 0.51 1.04 0.85 0.45 0.52 0.58 1.11 0.34 1.25 0.38 1.44 1.28 0.51