The dithering of one side edge while continuing {HEAD ~ the advance} of {TAIL ~ the opposite side edge} continues until the other of the fiducial marks is detected after which the advance of the sheet is resumed 
of
The dithering of one side edge while continuing { HEAD ~ the advance } of { TAIL ~ the opposite side edge } continues until the other of the fiducial marks is detected after which the advance of the sheet is resumed
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH