1. A change in inclination of the electromagnetic polarization ellipse as a traverse is made across a tabular conductor. The minor axis of the ellipse points to the upper edge of the target. 2. If the transmitter is west of the receiver and if a counterclockwise rotation is recorded as a south dip angle, a proper crossover occurs where electromagnetic dip angles change from south on the south side of a point to north on the north side. The axis of current concentration lies underneath the crossover point. Opposite of backward crossover or reverse crossover.