Spatial cuts of the AlO 6 → 5 emission imaged by ALMA. The radial profiles extend from the center of the star and represent three position angles: 54° (nearly northeast), 133° (south-east), and − 90° (west), shown in Fig. 3. Marked in green are characteristic locations within the envelope: the region closest to the star where hot dust has been observed in minimum/maximum light (inner/outer edge) (light green); the range of SiO maser rings (dark green); and the innermost radius where silicate dust is thought to condense in Mira stars (marked as “silicates”).