Conversion of observed Cr II line equivalent width values into log(g f) values using theoretical curves of growth for a given star. Blue lines represent theoretical curves of growth for different Cr II lines. Black circles are measured equivalent width values plotted using the log(g f)_input values, while black crosses are measured equivalent width values plotted using derived log(g f) values, i.e. the intersect of the equivalent width value with its respective curve of growth.