This readme describes the file in the USGS gas dataset and its contents. This readme also provides references to where the data is presented in the expedition proceedings.

UT-GOM2-2_USGS-gas-data.xlsx	
   Excel file of processed gas composition data by the U.S> Geological Survey. Results are presented in Site H: Figures F63 to F64 and F70 to F75 (https://doi.org/10.5281/zenodo.13971276).
      File Headers:
      Expedition – Expedition name – UT-GOM2-2
      Area – Lease block area – Walker Ridge 313 (WR313)
      Site – Site H
      Hole – Holes 003 and 002
      Core – Core number
      Core type – H = advanced piston core, X = extended core barrel, CS = Pressure Coring Tool with Ball Valve (PCTB) in the cutting shoe configuration, FB = PCTB in the face bit configuration.
      Section – Core section (number, or CC for material recovered from the core catcher)
      Piece – vertical sub-section of core sections (lettered)
      Sample type: Void gas – collected from voids within the core liner in conventional cores. Pressure core gas – collected from gas produced during depressurization of pressure cores. Hydrate gas was collected from cryo-frozen cores in which hydrate-bearing sediment was allowed to dissociate within a syringe.
      Compressed sample top depth (mbsf). Depth in meters below seafloor based on compressed core lengths (linear compression fits length of core to length of core advance and prevents overlap between cores). Equivalent to CSF-B in the International Ocean Discovery Program.
      Compressed sample bottom depth (mbsf). Depth in meters below seafloor based on compressed core lengths (linear compression fits length of core to length of core advance and prevents overlap between cores). Equivalent to CSF-B in the International Ocean Discovery Program.
      Methane (%), C1
      δ13C of methane
      Carbon dioxide, CO2 (ppm)
      Ethane (ppm), C2
      Propane (ppm), C3
      C1/(C2+C3), methane to ethane plus propane ratio
      C1/C2 methane to ethane ratio
      i-Butane (ppm)
      n-Butane (ppm)
      Neo-Pentane (ppm)
      i-Pentane (ppm)
      n-Pentane (ppm)
      Oxygen (%)
      Nitrogen (%)
