Calibrator solutions for 3C 147. These are two of the default plots generated by  PREFACTOR. On the left are bandpass solutions for the XX polarisation. The international stations are those with values of ~ 300 or above, while the Dutch station bandpass values are clustered between 100 and 200. The amplitude values are a correction factor that fixes the data scale to be in units of Janskys. On the right are phase solutions for the XX polarisation, referenced to CS001HBA (top left corner). Each of the sub-panels in the right hand panel share the same axes: 0–10 min for the time axis, and 120–168 MHz for the frequency axis. It is clear that the core stations (CS) and remote stations (RS) have phases that are close to each other and vary slowly in frequency, while the international station phases (labelled with country codes DE, FR, SE, IR, PL, UK) show faster variation with frequency (in the vertical direction). The units of phase are radians.