3D geometrical model of the Gemini-Monoceros X-ray enhancement. The different panels show the perspective (left) and orthographic top view (right). The units of the coordinates are pc, with the axes: x and y being the Right ascencion and Declination distance relative to the Monogem Ring, and the distance z from us. The Monogem Ring is located at (x, y, z) = (0, 0, 300). The different colored spheres indicate the different SNR (candidates) with the correct radius at the respective assumed distance. The Monogem Ring and G205.6+12.4 are shown in red and green, respectively, at D = 300 pc. The Monoceros Loop SNR at D = 1500 pc in orange, and G190.4+12.5 in blue at D = 1500 pc (assumed distances). The radii are to scale.