Left: flux-calibrated mid-infrared image of Si5 filter at 11.5 μm taken with CanariCam/GTC. This image is centred at the nucleus of NGC 835. The contour level with the lowest value is at 5.5σ. The continuous and dashed (white) ellipses show the best fit to the inner and outer ring, respectively (see text). North is up, east is left. Right: radial profile of NGC 835 centred at the nuclear position (blue solid line) compared to the PSF radial profile (dashed red line).