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