Default retention time model used during map simulation (via MSSimulator).
Feel free to train your own model, depending on your column conditions.

This model is trained from the supplementary material from the article:
Improved Peptide Elution Time Prediction for Reversed-Phase Liquid Chromatography-MS by Incorporating Peptide Sequence Information
Konstantinos Petritis,, Lars J. Kangas,, Bo Yan,, Matthew E. Monroe,, Eric F. Strittmatter,, Wei-Jun Qian,, Joshua N. Adkins,, Ronald J. Moore,, Ying Xu,, Mary S. Lipton,, David G. Camp, II, and, Richard D. Smith,
Analytical Chemistry 2006 78 (14), 5026-5039
http://pubs.acs.org/doi/suppl/10.1021/ac060143p
