Fig. 6From: Identification of significant proxy variable for the physiological status affecting salt stress-induced lipid accumulation in Chlorella sorokiniana HS1Performance validation of the clustering with Chl a only. The data used to make the clustering rules were expressed in Roman numerals to match the group numbers classified in Fig. 5. The validation data set was the same as the data used to validate the MLR and represented in Arabic numerals with their sample number. The samples were classified in cluster 1 (filled circle), cluster 2 (filled triangles), and cluster 3 (filled squares). CH Chl aBack to article page