Left: view of the nebula in the optical. The bright Hα+[ N ii ] ring nebula is illustrated in red (also shown in Fig. 1 at the same scale) while the fainter Hα+[ N ii ] emission is shown in blue, differently scaled in surface brightness, revealing the northern extension (Weis 2008). The continuum image that outlines the dust scattered nebula is presented in green. Right: contour image of the optical emission from the nebula (green lines) superposed on the infrared image of the nebula at 70 μm (also shown in Fig. 1 at the same scale). The size of each image is 1.5′× 1.5′. North is up and east is to the left.