Left: view of the optical Hα+[Nii] emission from the nebula M1-67. Center: contour image of the Hα+[Nii] emission from the nebula (green lines) superposed on the PACS infrared image of the nebula at 70 μm (shown also in Fig. 1 at the same scale). Right: view of the nebula in the continuum filter. This continuum image has been subtracted from the image obtained in the Hα+[Nii] filter to create the image seen in the leftmost panel and to emphasize the ionized gas emission. The size of each image is 4′× 4′ and the scale is logarithmic to better show the faint emission. North is up and east to the left.