Absorption by associated ionised gas in the SNR W41. Spitzer 3-colour image (RGB: 24, 8.0, and 3.6 μm) towards the W41’s complex with contours of radio continuum emission overlaid. Green contours (at 0.25 and 0.42 Jy beam⁻¹ levels) correspond to the 1.4 GHz image from MAGPIS, convolved to match the VLSSr resolution of 75′′. VLSSr 74 MHz continuum contours are superimposed in white (levels: 0.56 and 1.30 Jy beam⁻¹). Multiple H IIregions, A-H, in the field with known distances near W41 (~5 kpc) are marked by orange circles, while thermal sources (I-Z) with unknown distance are indicated by dashed violet circles (Anderson et al. 2014).