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