A variable which is functionally associated with the velocity of {TAIL ~ the vehicle}, such as the output speed of the transmission, engine speed or {HEAD ~ velocity} of the vehicle itself, is plotted on the abscissa of the diagram 
A variable which is functionally associated with the velocity of { TAIL ~ the vehicle } , such as the output speed of the transmission , engine speed or { HEAD ~ velocity } of the vehicle itself , is plotted on the abscissa of the diagram
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH