Distribution of Hα emission stars towards the Canis Major star-forming region. Only stars with positive parallaxes nearer than 10 kpc are shown, a total of 327 stars. The stars are divided into nearby stars, from 0 to 800 pc, which are likely dMe dwarfs (blue), from 800 to 1500 pc, which include all the members of the Canis Major association (red), and stars more distant than 1500 pc, which are likely Be stars (green). The red points closely follow the gas surrounding the CMa shell. The small group of green symbols near the bottom of the figure marks the distant cluster NGC 2345.