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 
534788735.12 s (sclk) for GC 1 chromatogram and 
534793066.5 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 signal is available in the file noise.csv.

GC column 1 run

peak 0 ;  GC1 INJECTION ; 0
peak 1 ;   ; 404
peak 2 ;   ; 498
peak 3 ;  ; 614
peak 4 ;  ; 842
peak 5 ;  ; 1049
peak 6 ;  ; 1102
peak 7 ;  ; 1969

GC column 4 run

peak 8 ;  GC4 IT FLASH 1 ; 0
peak 9 ;  ; 178
peak 10 ;  ; 224
peak 11 ;  ; 263
peak 12 ; ; 685
peak 13 ; BENZENE ; 701
peak 14 ; TOLUENE; 900
peak 15 ; ; 1019
peak 16 ;  ; 1061
peak 17 ;  ; 1087
peak 18 ; GC4 IT FLASH 2 ; 1101
peak 19 ;  ; 1109
peak 20 ;  ; 1287
peak 21 ;  ; 1319
peak 22 ;  ; 1325
peak 23 ;  ; 1326
peak 24 ;  ; 1345
peak 25 ;  ; 1380

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.