X-ray luminosity distribution of the stellar XMMSL2 sources with known parallax. Main sequence stars and giants are shown as green and blue dots, respectively. The red crosses show the X-ray luminosities of the volume limited NEXXUS sample (Schmitt & Liefke 2004). The extension in x-direction corresponds to the width of the spectral type, while the extension in y-direction shows the luminosity range in which 90 % of the NEXXUS dwarfs of the specific spectral type lie. The red dashed line represents the saturation limit at L_x/L_bol = 10⁻³ for dwarfs.