Fig. 5

pXRF spectra of selected spots. The color of the symbol corresponds to the analyzed shade. Dashed spectra are from the North wall. a Point 1; b point 4; c point 10; d point 12; e point 15; f point 17; g point 20; h point 21

pXRF spectra of selected spots. The color of the symbol corresponds to the analyzed shade. Dashed spectra are from the North wall. a Point 1; b point 4; c point 10; d point 12; e point 15; f point 17; g point 20; h point 21