XLF of U14 plotted at redshift z = 0.1 and z = 0.3 in the range 41 < log L_x< 44. The black line represents the best fit, grey regions show the effect of uncertainties in the parameters: dark (light) grey correspond to 1σ (2σ) region. The red line is U03 XLF. Red and blue points are taken from U14, and represent the data derived from the soft (<2 keV) and hard (>2 keV) X-ray bands respectively, converted in 2 to 10 keV luminosities as explained in U14.