Gain dynamic spectra ratio of the one-step to two-step method for 20 clusters around the phase centre for one station (CS001HBA0), obtained by DDECAL algorithm (top) and SAGECAL algorithm (bottom). Different polarisation components are added in quadrature. While gain differences between the one-step and two-step methods are more prominent in the phase centre for DDECAL (in clusters 2-7, top), the difference is more obvious outside the phase centre for SAGECAL (in clusters 11-20, bottom).