and C$_3$N, calculated by azimuthal average of the brightness distributions shown in Fig. \[fig:map\_all\]. Curves have been arbitrarily scaled in the $y$-axis for display.[]{data-label="fig:azimuth_average"}](fig_azimuth_average){width="\columnwidth"}

Information on the radial distribution of the species can be obtained by azimuthal average of the brightness distribution (see Fig. \[fig:azimuth\_average\]). The lack of strictly concentric shells, with arcs that cross each other within a spiral-like arrangement, produces a smoothing effect when azimuthally averaging. That is, the spatial resolution is degraded by averaging shells that are not strictly at the same radial position. Still, the information provided by this plot is of great utility in analyzing whether species share the same radial regions or whether there is some degree of stratification as a function of radius. The hydrocarbon radicals C$_2$H, C$_4$H, and C$_6$H reach their maximum brightness at the same radial position, between $15{\mbox{\rlap{.}$''$}}5$ and 16$''$, although the smallest one, C$_2$H, extends somewhat farther than the heavier ones. The cyanides, however, show much more disparate radial distributions. The distribution of HC$_3$N is the one which is most shifted to inner regions, as it emerges at radii as short as 7$''$ while the rest emerge at radial distances greater than 10$''$. The radial distribution of CN is 