Results of the GALFITM modelling for NGC 3686: the Herschel images from 100 to 500 μm (left panels), the models (middle panels), and the relative residual images (right panels, in the same units as presented in Fig. 1). The righthand colour bar shows the scaling of the residual images. Any masked objects are highlighted with a white colour. The galaxy and model images are given in a logarithmic scale. All images cover a field-of-view of 6.75′ × 8.35′.