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 resolution
Methane 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 file
GCMS_1US_STG3.FMT contains a description of each column following the existing archived format. An additional information
in the description using the keyword "CHANGED_STG2_3" indicates whether or not the column was modified between STG2 and
STG3 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 the
time 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 its
standard 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 HASI
data. Associated methane mole fraction corresponds to the retrieved value for the binned data. From 30 km and below, we used the
native GCMS vertical resolution. In this range, timestamps correspond to the exact time of each measurement according to GCMS
clock. Corresponding altitude, pressure and temperature were calculated using a linear interpolation between the two nearest HASI
points. Reported methane mole fractions and uncertainties correspond to the retrieved values for each altitude smoothed using a 10
points moving median.