Extended Data Fig. 3: Water-content calibration line and the IMF values.
From: Distribution of lunar surface water dependent on latitude and regolith maturity
a, Calibration line for H2O content determined from four standards. The Kovdor apatite (H2O = 0.98 ± 0.07%, δD = −66 ± 21‰; ref. 45), Durango apatite (H2O = 0.0478%, δD = −120 ± 5‰; ref. 46), a MORB glass reference material SWIFT MORB glass (H2O = 0.258%, δD = −73 ± 2‰47), and an olivine reference material San Carlos olivine (H2O = 1.4 ppm48) were used for calibration. KOV: Kovdor apatite; SWIFT MORB refers to a glass standard; DAP: Durango apatite; SCOL: San Carlos olivine. Data are presented as mean values ± error. b, Instrumental mass fractionation (IMF) values for KOV apatite, SWIFT MORB glass and Durango apatite. Data are presented as mean values ± 2 SE. The dashed lines and gray field denote the average value and two standard deviations. We used the IMF value of SWIFT MORB glass for the calibration.
