Figure 6 Performance of mosaic area estimation applied to ranges having six different shapes and sizes that vary from one trial to the next: 2 x 1 rectangles with one quarter removed (green); pairs of squares separated by one unit of distance horizontally and vertically (reddish violet); 4 x 1 rectangles (turquoise); squares (gold); rings with holes equal in diameter to that of the outer circle times 0.707, so half the area is empty (purple); and circles (red).r 2 = 0.9161 (three-quarter squares), 0.9535 (pairs of squares ), 0.9268 (4 x 1 rectangles), 0.9233 (squares), 0.9583 (rings), and 0.9317 (circles). Sample size is 10 data points. Data for each shape are offset by a factor of 104 for clarity; y-axis scale applies to the lowermost set.