First, to make the choice of correction as per Table , we determined the regime of the ESI source. The mix of 15 compounds was analysed under four different pressures (30, 50, 70, and 90 mbar), each run in triplicate, resulting in a array of migration times t c,p,i of migration times for each compound c, pressure p and replicate i, and another one of peak areas A c,p,i . (48)