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