Notes on the P1,P2 data set ground truth files
 
- Each line describes a consensus feature
- Each consensus feature is given by the  intensity, rt, and m/z values of the assigned features as well as the file name of the original feature file and the SEQUEST Xcorr score of the feature:
"file_name_1 Xcorr_1 intensity_feat_1 rt_feat_1 mz_feat_1 file_name_2 Xcorr_2 intensity_feat_2 ..."
 - Single space is used as separator
 - We use the intensity, rt, and m/z value to uniquely identify the origin of a feature