It is important that this inclination stays constant, and it can be adjusted to be less than one tenth of {HEAD ~ one second} of {TAIL ~ arc} if so desired 
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It is important that this inclination stays constant , and it can be adjusted to be less than one tenth of { HEAD ~ one second } of { TAIL ~ arc } if so desired
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH