Is the run number, that is present as the second field in fastq file header, sequential? What I mean if there are two run numbers in two different fastq files with the same Instrument ID, x and y. If x < y, does this imply that experiment with run number x is done before experiment y?
For example, consider these two headers:
1) @EAS139:76:FC706VJ:6:1101:20273:23294 1:N:0:CGATGT
2) @EAS139:89:FC706VJ:7:1101:7912:1314 2:N:0:GTGAAA
Can I say, that the experiment in 1st fastq file (run number 76) was done before the experiment associated with the 2nd fastq file (run number 89)?