FIG 2. Scatterplots show the intraobserver variability of repeated measurements in different cortical areas of 10 control subjects. A, Temporopolar cortex; B, entorhinal cortex; and C, perirhinal cortex. The limits of agreement between the first and the second measurements are expressed as the mean difference in volume: [volume in the first measurement minus volume in the second measurement (mm³)] ± 2 SD. Inserts in the lower left corner show the association between the first (y-axis) and second (x-axis) measurements. Mean indicates mean difference in volume; +2 SD, mean difference in volume plus 2 SD; -2 SD, mean difference in volume minus 2 SD