NGC 1366. Top panels: color-composite image in the U, B, V filters (left: U = blue, B = green, V = red) and W1, M2 and W2 filters (right: W2 = blue, M2 = green, W1 = red). The field of view is 5′× 5′, north is at the top, east to the left. Middle and bottom panels: W1, M2, and W2 luminosity profiles and residuals from their best fit with a single Sérsic law accounting for the filter PSF.