This line controls {HEAD ~ the Y axis motion} and Z axis motion of {TAIL ~ the platform} and is designated the YZ movement line 
of
This line controls { HEAD ~ the Y axis motion } and Z axis motion of { TAIL ~ the platform } and is designated the YZ movement line
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH