Average differences between the input and the inferred atmosphere at different optical depths. From left to right, we show the differences for temperature, LOS velocity, magnetic field strength and inclination, respectively. Line styles correspond to the case where we reach configuration C4 in Table 1 after running the previous cycles (solid) or to cases where we run a single inversion cycle using the nodes described in column C4 of Table 1 starting from the modified HSRA atmosphere (dashed).