Fig. 1.

Acceptance plot showing the classification of mCP samples in the test dataset (see Table 1) with the optimized SIMCA model (with 5 principal components). Each point represents the classification result for a single measurement of that dye sample. The x and y axes can be interpreted as the scores and orthogonal distances, respectively. Measurements falling within the acceptance region bounded by the green curve (defining critical distances for a Type I error of 5 %) are classified as pure dyes.