{TAIL ~ The next four figures} are stacked area charts showing {HEAD ~ the difference} from a left to right printed swath and an adjacent right to left printed swath 
{ TAIL ~ The next four figures } are stacked area charts showing { HEAD ~ the difference } from a left to right printed swath and an adjacent right to left printed swath
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH