Comparison of the 268.149 GHz line profiles in GY Aq1 and R Aql observed with the ACA and the mid and extended main array configurations. The ACA spectral resolution has been degraded here to 2 and 0.5 km s⁻¹ (GY Aql and R Aql, respectively) for comparison with the ~1 km s⁻¹ resolution of the mid and extended configurations of the main array. The epoch of the observations are indicated in the figure labels as well as the diameter of the extraction aperture given in parentheses (18.″0, 0.″4 and 0.″2 for GY Aql and 18.″0, 1.″0 and 0.″1 for R Aql). The vertical lines show the systemic stellar velocity.