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