For each run, the corresponding reference sequence is divided into bins or windows based on the percentage of G + C content ranging from 0 - 100%. The data is collected with picard tools CollectGcMetrics tool and you can read more about it here
For each run, the corresponding reference sequence is divided into bins or windows based on the percentage of G + C content ranging from 0 - 100%. The data is collected with picard tools CollectGcMetrics tool and you can read more about it here