Colour-magnitude diagrams (CMDs; left and middle) and absolute magnitude M_K normalised histograms (right), where M_K is estimated by means of the Gaia parallax at face value for the Kepler (grey) and C3 (orange) fields. Another CMD, including a shift in parallax, is shown for Kepler (red). We removed stars having a parallax with a relative error above 10% for Kepler, and 15% for C3. The black dashed lines indicate the expected range of values for the magnitude of the clump in the K band.