Amplitudes of a sample of flux calibrators (top: Titan, bottom: Neptune) as a function of UV-distance. In each case, three spectral windows are shown. The plots displaying Neptune data are plotted in log(Amplitude) to demonstrate the accuracy of flux calibration in resolved objects. Although the amplitudes recover the first eight nulls of the resolved Neptune emission, model fits using amplitudes up to the fifth null are very accurate. In each plot, blue and red points show the different polarizations.