The retention times are calculated from the moment the sample is injected
in the chromatographic column (IT FLASH or GC INJECTION). In the chromatogram, this
corresponds to the first peak observed in time, which is generated by the
flash heating of the injection trap of SAM-GC. This time is 
544201156.14 s (sclk) for GC 1 chromatogram and 
544205494.54 s (sclk) for GC 4 chromatogram . The retention times are 
calculated by subtracting this time, to the times of the peaks maxima.
The original TCD chromatograms are available in the file noise.csv.

GC column 1 run

peak 0 ;  GC1 INJECTION ; 0
peak 1 ;   ; 501
peak 2 ;   ; 837
peak 3 ;  ; 1130
peak 4 ;  ; 2028

GC column 4 run

peak 5 ;  GC4 IT FLASH 1 ; 0
peak 6 ;  ; 200
peak 7 ;  ; 624
peak 8 ;  ; 639
peak 9 ;  ; 764
peak 10 ;  ; 1043
peak 11 ; GC4 IT FLASH 2 ; 1101
peak 12 ; ; 1338


The abundance given in the table (species.csv) corresponds to the area of the 
most abundant mass peak which are measurable for each peak. The unit is 
counts/sec/sec. There is no baseline correction for this fit.
These surfaces are proportional to the amount of the species
detected when a peak is eluted. When peaks are co-eluted (over of different
peaks), the peaks are fitted using a gaussian function. If the fit does not work, 
only one surface value is given, corresponding to the sum of the
abundances of the species contributing to the peak.