That completes the information needed to plot δ s and δ p for all angles of incidence in Fig. 2, in which δ p is in red and δ s in blue. On the angle-of-incidence scale (horizontal axis), Brewster's angle is where δ p (red) falls from 180° to 0°, and the critical angle is where both δ p and δ s (red and blue) start to rise again. To the left of the critical angle is the region of partial reflection; here both reflection coefficients are real (phase 0° or 180°) with magnitudes less than 1. To the right of the critical angle is the region of total reflection; there both reflection coefficients are complex with magnitudes equal to 1.