pgb_liv\php_ms\Search\Parameters\MsgfPlusSearchParameters::setIsotopeErrorRange

Takes into account of the error introduced by choosing non-monoisotopic peak for fragmentation.

If the parent mass tolerance is equal to or larger than 0.5Da or 500ppm, this parameter will be ignored. The combination of -t and -ti determines the precursor mass tolerance. E.g. "-t 20ppm -ti -1,2" tests abs(exp-calc-n*1.00335Da)<20ppm for n=-1, 0, 1, 2.