TL contours of sound pressure along the cut-plane bisecting the wedge for Cases 1 (upper) and 2 (lower) in Example B. The panels in the left column ((a), (c)) shows the results calculated using the 3D PE model, while the panels in the right column ((b), (d)) refer to the results calculated using the source images method. The solid lines denote the limitation angle of the 3D PE solutions, i.e., 78.5°.