SNOMAN is also capable of producing another type of output, which is HBOOK histograms of singles data from the PMTs. To produce these the HST processor is invoked (however note that if you want to histogram data from all phototubes you will probably also have to increase the size of the PAWC common in memory, see the earlier section on installing the code). These are histograms of all the values of a particular entry in the PMT bank from a particular phototube for the events in a run. These are useful for calibration and monitoring purposes. The file hist.dat contains the description of the HIST bank which controls histogramming. This ability is currently somewhat rudimentary (as of Version 3_00), but we will add additional capability as it is clear what we need.