GCMS Huygens Dataset and methane mole fraction in Titan atmosphere

This archive contains the dataset relative to the publication "Reanalaysis of the Huygens GCMS dataset: I. High resolutionMethane vertical profile in Titan atmosphere" by Gautier et al. in A&A 2024.The entire set of recalibrated GCMS data is provided and includes the GCMS level 3 data product generated during this work.Following the nomenclature of the GCMS data archived on the PDS this file is named GCMS_1US_STG3.TAB. The associated fileGCMS_1US_STG3.FMT contains a description of each column following the existing archived format. An additional informationin the description using the keyword "CHANGED_STG2_3" indicates whether or not the column was modified between STG2 andSTG3 compared to the dataset retrieved on the PDS.The molefractions.csv table contains the retrieved methane mixing ratio through the atmospheric column. First column is thetime since beginning of GCMS measurements. Column 2, 3 and 4 are the altitude, atmospheric pressure and temperature, respec-tively, from HASI measurements for the corresponding time stamp. Column 5 and 6 are the retrieved methane mole fraction and itsstandard deviation. For altitudes comprised between 146 and 30 km, data has been binned to a kilometric resolution to enhance S/N.The associated values for time, altitude, pressure and temperature correspond to the average value of the bin in the GCMS and HASIdata. Associated methane mole fraction corresponds to the retrieved value for the binned data. From 30 km and below, we used thenative GCMS vertical resolution. In this range, timestamps correspond to the exact time of each measurement according to GCMSclock. Corresponding altitude, pressure and temperature were calculated using a linear interpolation between the two nearest HASIpoints. Reported methane mole fractions and uncertainties correspond to the retrieved values for each altitude smoothed using a 10points moving median.