These figures show the observed gas-blank subtracted (gbsub) counts per second (CPS) for Pb206, Pb207, and U238. Additionally they show the Pb206/U238 and Pb207/U238 ratios.
Each figure is for a single material over one analytical session at a specified spot diameter. The (point) marker colours represent an individual analysis of the material in that session. The colour scheme used is "batlow" from Scientific Colours.
These are part of the publication "The quantification of downhole fractionation for laser ablation mass spectrometry".