When the temples recede for a NW2, it can lead to a V type shape, where the hairline is a straight line from the center of the hairline (furthest point outward) to the temples (most receded point). It can also go into a U type shape where it's curved, and often more receded. But the NW3 is always a U type shape.
Does the V turn into the U?
Does the V turn into the U?