The graphical information includes information about: the necessary optical part which should be newly installed in the main equipment; and {HEAD ~ the installed optical part} which should be removed from {TAIL ~ the main equipment} 
removed from
The graphical information includes information about : the necessary optical part which should be newly installed in the main equipment ; and { HEAD ~ the installed optical part } which should be removed from { TAIL ~ the main equipment }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL