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