15 .\" This is designed so that \(ul, \(rn and \(br form corners.
16 .if !c\[br] .char \[br] \Z'\v'.25m'\D'R .04m -1m''
17 .if !c\[ru] .char \[ru] \Z'\v'-.02m'\D'R .54m .04m''\h'.5m'
18 .if !c\[rn] .char \[rn] \Z'\v'-.77m'\D'R .54m .04m''\h'.5m'
19 .if !c\[ul] .char \[ul] \Z'\v'.23m'\D'R .54m .04m''\h'.5m'