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 
566985146.O s (sclk) for GC 1 chromatogram and 
566989583.0 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 ;   ; 424
peak 2 ;   ; 465
peak 3 ;  ; 680
peak 4 ;  ; 860
#peak 5 ; ; 948
#peak 6 ;  ; 1021
#peak 7 ;  ; 1078
#peak 8 ;  ; 1780

GC column 4 run

peak 9 ;GC4 IT FLASH 1 ; 0
peak 10 ; ; 172
peak 11 ;  ; 178
peak 12 ;  ; 223
peak 13 ; ; 278
peak 14 ; ; 316
peak 15 ;  ; 419
peak 16 ; ; 439
peak 17 ;  ; 481
peak 18 ;  ; 691
peak 19 ;  ; 723
peak 20 ;  ; 752
peak 21 ;  ; 764
peak 22 ;  ; 808
peak 23 ;  ; 835
peak 24 ;  ; 847
peak 25 ;  ; 866
peak 26 ;  ; 901
peak 27 ;  ; 999
peak 28 ;  ; 1097

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.