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 
562744596.9 s (sclk) for GC 1 chromatogram and 
562748792.5 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 chromatograms are available in the file noise.csv.

GC column 1 run

peak 0 ;  GC1 INJECTION ; 0
peak 1 ;   ; 350
peak 2 ;   ; 456
peak 3 ;  ; 549
peak 4 ;  ; 627
peak 5 ; BENZENE ; 690
peak 6 ;  ; 981
peak 7 ;  ; 1839

GC column 4 run

peak 8 ; GC4 IT FLASH 1 ; 256
peak 9 ;  ; 194
peak 10 ;  ; 207
peak 11 ; ; 227
peak 12 ; ; 290
peak 13 ;  ; 462
peak 14 ;  ; 629
peak 15 ; BENZENE ; 647
peak 16 ; TOLUENE ; 772
peak 17 ;  ; 1041
peak 18 ; GC4 IT FLASH 2 ; 1101
peak 19 ;  ; 1337

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.