For a detailed description of spectral scans and line identification, data processing and calibration, the reader is referred to the Supplementary Material accompanying a paper submitted to Science in March 2013 entitled: "Isotope Ratios of H, C and O in Martian Atmospheric Water and Carbon Dioxide Measured by the Curiosity Rover", by Chris R. Webster, Paul R. Mahaffy, Gregory J. Flesch, Paul B. Niles, John H. Jones, Laurie A. Leshin, Sushil K. Atreya, Jennifer C. Stern, Lance E. Christensen, Toby Owen, Heather Franz, and the MSL Science Team.  This document is also available on request.  
Isotope ratios given refer to SMOW for oxygen isotopes and VPDB for 13C ratios. These ratios were determined using identical data processing software in comparison to certified calibration gas or liquid standards determined by IRMS.  
In some cases (entries marked with "x") scientifically useful data was not retrieved due to instrumentation issues such as fast moving spectral scans or poor signal-to-noise ratios. 
All isotope delta values and their standard errors (one-sigma, SE) are given in "per mil" according to standard convention. 
In most cases, values for d13C, d18O and d17O values result from the mean value from the two spectral regions 1 and 2 accessed by a single laser by changing the laser temperature. Values for d13C18O multiple isotope come only from Region 2.