Specifically, {TAIL ~ the elements} in each spatial period of {HEAD ~ m elements} in the second line have m mutually different responses corresponding to the dither code, where m is at least 4 and is typically 16 
Specifically , { TAIL ~ the elements } in each spatial period of { HEAD ~ m elements } in the second line have m mutually different responses corresponding to the dither code , where m is at least 4 and is typically 16
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH