Direct Analysis in Real Time Mass Spectrometry for the Nondestructive Investigation of Conservation Treatments of Cultural Heritage

Figure 7

Results of canonical analysis: canonical scores of Root 1 and Root 2 (a). The samples are separated along the two roots in the three classes: untreated parchment sample (red), the parchment sample treated with castor oil (blue), and the parchment sample treated with glycerol (green). Circles represent samples from the training set while crosses represent samples from the test set. (b) and (c) represent the weights of the original variables on Root 1 and Root 2, respectively: original variables are reported on the -axis and the weights on the -axis. Only the most significant weights are reported (identified by normal probability plots).

(a)

(b)

(c)