a)L′-band NACO PSF with the APO165 pupil mask in the beam. b) L′-band NACO coronagraphic image with the star centered on the AGPM (the dynamic range and corresponding colorbar/scale are a factor of 10 smaller than in image a)). c): Result of our PCA-ADI data reduction pipeline, revealing a putative faint off-axis M2V companion at only (the dynamic range and corresponding colorbar/scale are a factor of 100 smaller than in image a)). The scale is linear on all images (and scaled down by a factor of 10 and 100 for b) and c), respectively), illustrating in sequence the benefits of coronagraphy and optimized data reduction technique. The bottom color bar refers to figure a)).