Comparison of the shape of some DIBs towards M17 (B111, green solid line) with the sightline towards Herschel 36 (purple dotted line) and a “nominal” sightline (black dashed line). All the spectra have been convolved to the same resolution and scaled to have the same line central depth. The M17 DIB profiles do not show an extended red wing or any other anomaly with respect to the DIB in HD 161061.