Influence of magnetic field strength on spot RVs. Line profiles with different field strengths were used inside the spot. Spot RVs calculated with B = 0 G (black solid line), with B = 20 G (green long dashed line), with B = 100 G (blue short dashed line), and with B = 500 G (red dotted line). The results for the FeI line at 6165 Å are shown in the left panel, and the results of the FeI line at 6173 Å can be seen in the right panel. The gray solid line in the right panel indicates the results of the FeI line at 6165 Å for comparison.