about barrel

now, pdbsum has info like this in graph.
for 1neb, strand #2 should connect with strand #3,
but pdbsum missed on this one because the connection between Str#2 and Str#3
is on res#32 and res#40, but pdbsum doesn't consider #32 is part of Str#2.
and they also lost the related direction info on sheet#1 and sheet #2 (actually, sh#1 and sh#2 will be considered as one sheet in a barrel)