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 
550409567.14 s (sclk) for GC 1 chromatogram and 
550413892.56 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 ;   ; 507
peak 2 ;   ; 559
peak 3 ;  ; 669
peak 4 ;   ; 772
peak 5 ;  ; 889
peak 6 ;  ; 1002
peak 7 ;  ; 1131
peak 8 ;  ; 1229
peak 9 ;  ; 1328
peak 10 ;  ; 1895

GC column 4 run

peak 11 ;GC4 IT FLASH 1 ; 0
peak 12 ; ; 192
peak 13 ; ; 203
peak 14 ; ; 250
peak 15 ; ; 278
peak 16 ; ; 345
peak 17 ; ; 382
peak 18 ; ; 412
peak 19 ; ; 643
peak 20 ; ; 664
peak 21 ; ; 853
peak 22 ; ; 970
peak 23 ; ; 1139
peak 24 ; ; 1436
peak 25 ;GC4 IT FLASH 2 ; 1700
peak 26 ; ; 1934
peak 27 ; ; 1992

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.