Some info abou Sti hits.
It is run 
'bfc.C(10,"P2014a,pxlHit,istHit,btof,mtd,mtdCalib,BEmcChkStat,CorrX,OSpaceZ2,OGridLeak3D,-hitfilt,-evout"
,"/star/institutions/lbl_scratch/hft/daq/Run14/166/15166030/st_physics_15166030_raw_0000012.daq")'

Hit candidate is a hit whith Xi2 <20. Usually the hit with the minimal Xi2 accepted.
No more then 10 hits accounted. But these 10 hits have the smallest Xi2 from all accepted hits

See distribution of hit candidates. Peak in nHits=1 but nHits>1 is not negligible. nHits==0 excluded.

Now number of hit candidates against Rxy. The first group in Rxy is Pxl1, second one Pxl2, the third one is Ist
The others are TPC
You see that 10 candidates usually in Pxl but for Ist it is non zero also.
For TPC situation is much better.