Moment-zero maps of the emission in the SO J_K = 8₈–7₇ line observed in 2017 November 9 and 2023 July 6 and 14. The approximate pulsation phases (φ) of Mira A at the times of the observations are given at the top of each panel. The white contours mark where emission reaches three times the RMS noise level in each image. The straight white line in the right panel indicates the direction used to measure the size of the NW lobe in the two epochs.