Nodule identification and slit orientation on M′-band image (left) and its deconvolved image (right). The distance between the ticks inside the slit is 0.1″ i.e. about 7.5 pc. In white, the 47° PA slit aligned with the nodules. In green, the 12° PA slit. The colors are in arbitrary units and are chosen so that the structures mentioned in this article appear clearly.