Calibration of the ELAIS-N1 flux density scale using different methods. The default DDF-PIPELINE scale is set to unity and marked with a blue cross. The scaling factor obtained with the 87GB calibrator is marked with an encircled orange cross. The flux density ratios with respect to other surveys in the literature and their errors are shown in different colours and the fitting line is shown as a red dashed line. The inset shows a zoom view of the area close to the 146 MHz frequency of the observation.