Figure 2: Velocity surface of Pbnm- and Cmcm-CaIrO3.

Upper (a) and lower (b) plots correspond to Pbnm- and Cmcm-CaIrO3, respectively. Black lines are drawn for the present results, while blue lines are drawn for the results obtained by Tsuchiya and Tsuchiya17. Upper lines correspond to the P-wave velocity, and lower lines to the S-wave velocity. Open circles ‘o’ and crosses ‘+’ for VS specify in-plane and out-of-plane particle motions.