{TAIL ~ The characteristic curves} of the diagram are defined with reference to {HEAD ~ the minimum engine torque} 
{ TAIL ~ The characteristic curves } of the diagram are defined with reference to { HEAD ~ the minimum engine torque }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD