Table 2 Calibration sequences. LR/PR – linear regression on peptide rule, IC – Internal calibration with two iterations. (Bruker Reflex – mass measurement error (MME) window of 450 and 250 ppm, Bruker Ultraflex 250 and 125 ppm); MST – MST calibration method computed with an search window of ± 0.4Da; TPS-IC – Pre-processing (TPS calibration) and subsequent internal calibration with a MME window of 250 ppm; TPS-MST – pre-processing and an MST with a search window of ± 0.25Da;

From: Calibration of mass spectrometric peptide mass fingerprint data without specific external or internal calibrants