HI column density (N_H) map in the CMa OD field from the HI4PI survey (left). The red dots show the position of X-ray sources classified as CMa OD members and the yellow dots are the CMa OD member candidates. The XLF of sources, which are classified as CMa OD members or candidates, are shown on the right. All sources (members and candidate members of CMa OD) are plotted by dashed lines and only the members by solid lines. The black and gray lines show the absorbed and unabsorbed fluxes, respectively.