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The four left hand plots relate the scores for PC 2 to environmental pressure, using information on the perimeter curve, the ridge curve, both of these curves, and a full surface representation. The two right hand plots show the perimeter shape changes associated with PCs 2 (upper) and 3 (lower), represented through the curves associated with +3 (dotted) and −3 (solid) standard deviations from the mean of the corresponding scores.
