a tension leg platform station which includes {HEAD ~ a platform} that floats at {TAIL ~ the sea surface} and a plurality of tension lines that extend vertically from said platform to the seafloor 
floats at
a tension leg platform station which includes { HEAD ~ a platform } that floats at { TAIL ~ the sea surface } and a plurality of tension lines that extend vertically from said platform to the seafloor
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH