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