Effect of resolving power, R, on the determined solar scale factor. Top: Scale factor against resolving power, where individual results with different velocity offsets but identical resolving power are median-binned. The horizontal line indicates a scale factor of one, identical to the result from the unconvolved, unshifted FTS. Bottom: Measured ve- locity offset from the third signature fit, corrected for the synthetic one and binned by R. The dashed line marks zero velocity offset.