private static double GetCollisionEnergy(SrmSettings settings, PeptideDocNode nodePep,
TransitionGroupDocNode nodeGroup, CollisionEnergyRegression regression, int step)
{
var charge = nodeGroup.TransitionGroup.PrecursorAdduct;
double mz = settings.GetRegressionMz(nodePep, nodeGroup);
return(regression.GetCollisionEnergy(charge, mz) + regression.StepSize * step);
}