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(a) D/H ratios versus H2O contents measured in apatite in low-Ti and high-Ti Apollo mare basalts and in basaltic meteorites. OG stands for olivine gabbro lithology in NWA 773. Data are from [52,54,57,59]. (b) Histograms of H2O contents in terrestrial and in lunar apatites from mare basalts. Data for terrestrial apatites are from [60–63], and for lunar apatites from [52–57].
