{HEAD ~ An impurity concentration C} is the optimum concentration of lightly doped diffusion regions that achieves {TAIL ~ the lowest hot carrier effect} 
{ HEAD ~ An impurity concentration C } is the optimum concentration of lightly doped diffusion regions that achieves { TAIL ~ the lowest hot carrier effect }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL