What factors does Percolator consider when used with SequestHT?

I received this cool list today from a colleague.  This is the list of features from SequestHT that Percolator uses in its rescoring algorithm.

Delta Cn2

 Binomial score

 % Isolation Interference

 Observed Mass

 Delta Mass [Da]

 Delta Mass [ppm]

 Absolute Delta Mass [Da]

 Absolute Delta Mass [ppm]

 Peptide Length

 Is z=1

 Is z=2

 Is z=3

 Is z=4

 Is z=5

 Is z>5

 # Missed Cleavages

 Log Peptides Matched

 Log TIC

 Fraction Matched Intensity

 Fragment Coverage Series ABC

 Fragment Coverage Series XYZ

 Log Matched Fragment Series Intensities ABC

 Log Matched Fragment Series Intensities XYZ

 Longest Sequence Series ABC

 Longest Sequence Series XYZ

 IQR Fragment Delta Mass [Da]

 IQR Fragment Delta Mass [ppm]

 Mean Fragment Delta Mass [Da]

 Mean Fragment Delta Mass [ppm]

 Mean Absolute Fragment Delta Mass [Da]

 Mean Absolute Fragment Delta Mass [ppm]

 XCorr

Thanks, Kai, for generating this list!