ALMA observations of AlF lines towards IK Tau, R Dor, and W Hya (Black solid lines) overlaid with LTE model results using T_rot = 145 K (red dashed lines) and T_rot = 300 K (green dashed lines) that are detailed in Sect. 3.3. The line rest frequencies and transition are stated in each panel. The AlF (v = 0, J = 7–6) line emission at 230.7938 GHz can potentially be blended with ⁵⁰TiO₂ line at 230.7931 GHz. The grey dashed lines show the rms level.