The comparator 92 compares {TAIL ~ the image data}, in {HEAD ~ units} of dot signals, with the reference data supplied from the main controller 71 
The comparator 92 compares { TAIL ~ the image data } , in { HEAD ~ units } of dot signals , with the reference data supplied from the main controller 71
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH