Figure 2

Distribution of the spherical distance in meters (ρ) between criterion standard and vendor-assigned coordinates, by vendor. Column I: Scatterplots in which Xs and center points represent vendor-assigned and criterion standard coordinates, respectively. Columns II and III: Normalized frequency histograms before (II) and after (III) log-transformation. Columns I and II exclude outlying values to allow equal cross-vendor scaling of axes in meters. n = sample size. sd = standard deviation.