Dependence of the average of the zeroth and second moment maps (upper and lower panels, respectively) on the projection angle for each of the species for which we have produced synthetic observations. Averages are computed within the red ellipses shown in the rightcolumn of Fig. 3. Shaded regions show the 16th and 84th percentiles of the distributions of values within the ellipses shown in the right column of Fig. 3. For all species, we observe a decrease in the derived velocity dispersion with increasing polar angle. The same trend is true for the velocity-integrated emission, apart from N₂H⁺, for which the average of the zeroth-moment maps remains roughly constant.