{TAIL ~ The first scan unit} 110 comprises an exposure lamp 114 and {HEAD ~ a first reflection mirror} 115 
{ TAIL ~ The first scan unit } 110 comprises an exposure lamp 114 and { HEAD ~ a first reflection mirror } 115
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH