Fig. 4From: Characterization of pre-Columbian artefacts in situ through handheld portable X-ray fluorescence spectrometry: the case of ceramics from the Mochica site of San José de Moro (Peru)PCA biplot (left) and PCA scree plot (right) using CLR transformed HHpXRF raw intensities data. “SJM-1”: black dots (85% confidence ellipse); “SJM-2”: gray triangles (85% confidence ellipse). Var-cov matrix was employed to project all compositional informationBack to article page