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 (IT) of SAM-GC. This time is 
691308558.26 s (sclk) for GC 2 chromatogram and 
691312838.14 s (sclk) for GC 5 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 2 run

peak 0 ;  GC2 INJECTION ; 0
peak 1 ;   ; 444
peak 2 ;   ; 637
peak 3 ;   ; 1077

GC column 1 run

peak 4 ; GC5 INJECTION  ; 0
peak 5 ;   ; 234
peak 6 ;   ; 325
peak 7 ;   ; 446
peak 8 ;   ; 644
peak 9 ;   ; 734
peak 10 ;   ; 1324

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.