This repository contains data to accompany the publication of our manuscript, "Thermal Structure of the Martian Upper Atmosphere from MAVEN NGIMS" which appears in the Journal of Geophysical Research: Planets. The repository contains .mat files of NGIMS densities and temperatures, as well as associated ephemerides. The filenames have the following structure, mvn_ngi_s3_BIN#_YYYYMMDDtoYYYYMMDD_TID##toTID##_ORBITtoORBIT.mat. Each .mat file contains a MATLAB struct named s3. Each s3 struct contains arrays of TIDs, orbits, dates, filenames of data products used to construct the s3, and periapsis information for each orbit. Mean profiles of detector counts and count rates, Ar, CO2, and N2 densities, density corrections, temperatures derived from the densities, altitude, latitude, longitude, local time, solar zenith angle, Ls, heliocentric distance, spacecraft position and velocity, solar latitude and longitude, and NGIMS ram angle are also included. In the "pass" struct within each s3 struct, there are data for each individual orbit in the s3 file. That is, the pass structure contains the data from each orbit which has been binned to obtain the mean profiles in the s3 struct. The pass struct is accessed by commands of the form, s3.pass(n).FIELD where n is an integer between 1 and length(s3.orbit) indicating the orbit in s3.orbit or TID in s3.tid to be accessed and FIELD the field, such as den_Ar (Ar density) or tmp_Ar (Ar temperature), to be accessed. For more information, please contact the corresponding author of the manuscript.