The Swift X-ray (0.1–2.4keV) flux of the sources in our sample measured simultaneously with Planck is plotted against the 0.1–2.4keV flux reported in the BZCAT catalog (83 sources). The three solid lines represent equal fluxes (i.e., no variation) and a factor of two variability above or below the equal flux level. Note that several points are outside the factor of two variability lines, revealing variability of up to about a factor ten.