Muon (Medium WAMUS)

 A medium muon has at least one scint hit in A-layer, one 
 scint hit in B or C layer, a 2+ wire hit segment in the 
 A-layer and a 2+ wire hit segment in B&C layer. It doesn't
 necessarily pass the local track chi^2 cut.

 N
 -----
 The number of muon segments in the WAMUS system per event.

 Exchange 02-Apr-2003:
 Question (HTD): I don't really know if this is segments. I guess 
 that because it comes peaked in 2's.
 Answer      (): 
 
 PT
 -----
 The pT (GeV/c) of all muons.  This comes from the tracker if the muon is matched.
 Otherwise it is the local muon pT.  If the local fit was successful, 
 then the global pt is the result of the combination of both measurements 
 (dominated by the tracker measurement of course). 

 ETA
 -----
 Physics eta of central muons. 

 PHI
 -----
 Phi of central muons.  The narrow deficits are due to phi-cracks between
 octants.  It's impossible to get a medium quality muon in part of octants
 5 and 6. Thus the hole.

 CHISQ
 -----
 The chi-sq of the local muon fit.

 W HITS A
 --------
 The number of PDT hits in the A-layer. Most of
 the A-layer has 4 decks. 

 W HITS BC
 ---------
 The number of PDT hits in the B and C layers, summed.
 These chambers have 3 decks. The peak at zero is A-stubs.
 
 SCINT HITS A
 ------------
 The number of A-layer scintillator hits.

 SCINT HITS BC
 -------------
 The number of B + C layer scintillator hits. The central has,
 except in some special places, only one b or C layer of 
 scintillator.  The forward muon system usually has both.