The bars and {HEAD ~ spaces} are arranged in a plurality of sequential groups defining {TAIL ~ respective characters} of equal width 
The bars and { HEAD ~ spaces } are arranged in a plurality of sequential groups defining { TAIL ~ respective characters } of equal width
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH