HD 179218 line profile (top panel) and SA signal (lower panel). In the upper panel, the average profile of all three observations is presented (in black). The difference between the average profile and the profile from each observation is plotted above. The horizontal black line indicates the instrumental resolution of the observation. HD 179218 was observed in 2016 (Brittain et al. 2018) with the slit aligned with the semimajor axis (in red) and in 2020 with the slit aligned with the semimajor axis (in blue) and the semiminor axis (in green). There is no evidence of variability in the line profile—either temporally or due to changes in the orientation of the slit. In the lower panel, the SA signal for each date and PA are plotted using the same color scheme. The average of the SA signal measured with the slit aligned with the semimajor axis of the disk (in black) is also plotted. The SA signals measured in 2016 and 2020 are consistent.