In {TAIL ~ the cross section}, {HEAD ~ the lower flange} is thicker than the upper flange and the lower flange is wider than the upper flange, and the neutral axis of upward/downward bending 
In { TAIL ~ the cross section } , { HEAD ~ the lower flange } is thicker than the upper flange and the lower flange is wider than the upper flange , and the neutral axis of upward / downward bending
REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH