Gas safety report

This composite report returns data from two different gas chromatograph configurations (GC3 and NGA). Each row combines data from several measurements made on the same sample at the same time for a particular headspace or vacutainer sample. If data do not exist for a particular expedition, the column does not appear. Gas samples were measured by gas chromatography and either flame ionization detection (GC-FID) or thermal conductivity detection (GC-TCD). Reported analytes may include methane, ethane, ethene, propane, propene, n-butane, i-butane, n-pentane, i-pentane, n-hexane, i-hexane, n-heptane, i-heptane, nitrogen, oxygen, carbon monoxide, carbon dioxide, and hydrogen sulfide. When data are available, methane to (ethane + ethene) ratio (C1/C2 ratio) is reported. To identify individual samples and tests, see each separate analysis (GC3, NGAFID, and/or NGATCD).

Data File format

	Exp: expedition number
	Site: site number
	Hole: hole number
	Core: core number
	Type: type indicates the coring tool used to recover the core (typical types are F, H, R, X).
	Sect: section number
	A/W: archive (A) or working (W) section half.
	Top offset on section (cm): position of the upper edge of the sample, measured relative to the top of the section.
	Bottom offset on section (cm): position of the lower edge of the sample, measured relative to the top of the section.
	Top depth CSF-A (m): location of the upper edge of the sample expressed relative to the top of the hole.
	Top depth CSF-B (m): location of the upper edge of the sample expressed relative to the top of the hole.
	Test code: sample collection method: HS = headspace, VAC = vacuum gas sampler (Vacutainer tube).
	Data columns: header lists parameter measured and concentration units, followed by wavelength (for ICP-AES) and analysis method.
	Text ID: automatically generated unique database identifier for a sample, visible on printed labels.
	Test No.: unique number associated with the instrument measurement steps that produced these data.
	Comments: observer's notes about a measurement, the sample, or the measurement process.
