Brightness distributions of the cyanides HC₃N, HC₅N, C₃N, and CN along a strip intersecting the star at PA = 45°. Curves are extracted from the maps shown in Fig. 1 and have been arbitrarily scaled and shifted in the y-axis for display. Horizontal dashed lines indicate the zero of intensity. Gray vertical shadows indicate the positions of brightness maxima in the SW direction from the star, at 11′′, 15.′′5, 21.′′5, and 27′′.