Same as Fig. 12c (spatial distribution in the age range 10–55 Myr), but for low-mass stars only. In the three panels (a–c), the stellar masses are broken down in three mass ranges (0.5–1 M⊙, 0.5–0.8 M⊙, 0.5–0.7 M⊙, respectively), black diamonds represents XMM-Newton sources, and crosses indicate ROSAT sources. As discussed in the text (Sect. 7.2) and as is visible in Fig. 6, the nearly complete absence of stars with M <0.7 M⊙ is due to the decline of their magnetic activity after ~10 Myr.
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