Figure 2 in The potential for using shell proteins in gastropod systematics, assessed in patellogastropod limpets

Figure 2. PCA analysis of the ratio of the numbers of peptide spectrum matches in individual proteins to the number in B3A0P1. The x and y axes show principal component 2 and principal component 3 that respectively explain 11% and 8.1% of the total variance. PCA1 (not graphed) explains 46.81% of the variation. Prediction curves are drawn so that with probability 0.95, a new observation from the same group will fall inside the ellipse. The legend identifications are: Lm: Lottia cf. mixta; Np: Notoacmea petterdi; Nsp: Notoacmea sp.; Pl: Patelloida latistrigata; Pm: Patelloida mimula; Sc: Scutellastra chapmani; Sp: Scutellastra peronii; Ct: Cellana tramoserica; and Sd: Siphonaria diemenensis.