In the meantime, the pinholes SS12, {TAIL ~ SS13} are partially overlapped with {HEAD ~ the focused target track} S11 
In the meantime , the pinholes SS12 , { TAIL ~ SS13 } are partially overlapped with { HEAD ~ the focused target track } S11
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH