Integrated intensity along the line-of-sight for the base model − 171, at the four different angles considered: 0°,30°,45°, and 60° (see Sect. 2.4 for more details). The snapshot is taken at one-third of the mode period. The crosses in each panel denote the location of the 2 line-of-sight rays defined in Sect. 2.3. In each panel, the left and right crosses correspond to the rays crossing a node and an anti-node of the oscillation.