In the practice, in most applications, said {HEAD ~ frontal plane} of {TAIL ~ the store} is vertical, and said generatrixes and axis are vertical too 
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In the practice , in most applications , said { HEAD ~ frontal plane } of { TAIL ~ the store } is vertical , and said generatrixes and axis are vertical too
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH