“…A plot of the scores for each sample from Table II is provided in Figure 18 and shows how the samples are grouped along the first source of variance. Sample groups [1, 2, 3, 4], [5,6,7,8], [9,10,11,12], and [13,14,15,16] correspond to increasing silicate concentration at constant phosphate, while sample groups [1, 5,9,13], [2,6,10,14], [3,7,11,15], and [4, 8,12,16] correspond to increasing phosphate at constant silicate. If one were to "connect the dots" for these two separate groupings, a series of four vertical and four horizontal lines would result.…”