It may be desirable to position {HEAD ~ a sensor} or control module between {TAIL ~ the sand face completion sections} 204 and 240 , generally in a region indicated as 206 in FIG 2 
between
It may be desirable to position { HEAD ~ a sensor } or control module between { TAIL ~ the sand face completion sections } 204 and 240 , generally in a region indicated as 206 in FIG 2
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH