The barcode has I first columns of modules and {HEAD ~ J rows} of {TAIL ~ modules} transverse to columns 
of
The barcode has I first columns of modules and { HEAD ~ J rows } of { TAIL ~ modules } transverse to columns
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH