Mid-IR images of the central 2″ × 2″. For each galaxy, the left and right panels are the original and the PSF-subtracted images, respectively. The gray circles indicate the FWHM of the standard star as fit with a 2D Gaussian. The star symbol marks the peak of the mid-IR emission before PSF subtraction. The first contour with a solid line is at a 3 × σ_bk level and the next contours are at 5, 10, 15, 20 × σ_bk levels. For NGC 4941 the dashed lines in the PSF-subtracted image are 2 × σ_bk. All the images are oriented north up, east to the left. We smoothed the original and PSF-subtracted images with a Gaussian function (see text for more details). For each galaxy we display the two images with the same intensity and contour levels.