Data Set Overview : This archive contains oxide abundance data derived from X-ray analyses of the MER APXS (Alpha Particle X-Ray Spectrometer) Reduced Data Record (RDR) products. A description of the data analysis procedure and interpretation of the results can be found in Gellert, R., et al. (2006), Alpha Particle X-Ray Spectrometer (APXS): Results from Gusev crater and calibration report, J. Geophys. Res., 111, E02S05, doi:10.1029/2005JE002555 [GELLERTETAL2006], and in Ming, D.W. et al. (2008), Results of the Alpha Particle X-Ray Spectrometer from Cumberland Ridge to Home Plate, J. Geophys. Res., 113, E12S39, doi:10.1029/2008JE003195 [MINGETAL2008].   Processing : The Committee On Data Management and Computation (CODMAC) data level numbering system is used to describe the processing level of the oxide abundance data product. The products are considered CODMAC Level 5, Derived Data equivalent to NASA level 3.  The APXS oxide abundance data products were generated by the MER APXS Team. A nonlinear least squares algorithm was used to derive peak areas of characteristic element lines from APXS summed spectra. Peak areas were converted into element or oxide concentration using instrument calibration tables. Details of data processing and calibration are given in Gellert et al. 2006. The data were derived from APXS reduced data records (RDRs) from both rovers.   Data : Each APXS oxide abundance data file is a table. Columns are variable length and are delimited with commas. Each row is terminated with a carriage return and line feed character.

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