There are tar files available under the section "Downloading annual collections of data" for downloading the complete set.
The data products are simple ASCII tables. The NGIMS data consists of 5 components: Raw, Calibrated and Derived Single Species Abundances and Altitude resampled abundances. One or 2 files span one MAVEN orbit, covering the interval when the craft was at an altitude of 500Km or less.
Indices, that can be used for planning data selection, tabulate information associated with each periapsis passage for which NGIMS data is available. The associated geometry is given at the time of closest approach.
Calibrated Data (csv)
Single species abundance (csv)
Altitude resampled abundances (csv)
Scale heights and temperatures (csv)
Retrieving Raw Data and Calibration Information
Calibrated and derived data can be retrieved by selecting among the following data types for specified time intervals
Data Types - See the Software Interface Specifications document, Page 27 - Table 6 for explanations and note caveats and Product Version Changes associated with this data