Added line (\hrule) below title and made slight changes to header spacing.
Added line (\hrule) below title and made slight changes to header spacing.

EmbrietteH/American-Gut,biocore/American-Gut,wasade/American-Gut,EmbrietteH/American-Gut,mortonjt/American-Gut,JWDebelius/American-Gut,JWDebelius/American-Gut,wasade/American-Gut,biocore/American-Gut