In order to provide a suitable resistivity, {HEAD ~ the OSCL} 35 may be doped with {TAIL ~ sufficient conductive material} to have a moderate resistivity 
doped with
In order to provide a suitable resistivity , { HEAD ~ the OSCL } 35 may be doped with { TAIL ~ sufficient conductive material } to have a moderate resistivity
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH