Assuming thermally emitting dust, with a K-band flux ratio of 1% relative to a star of 6000 K, the curves show the expected contrast as a function of wavelength, and each curve corresponds to a different dust temperature. The shaded regions correspond to the accessible spectral bands for different interferometers, including second-generation instruments such as GRAVITY (Straubmeier et al. 2014) and MATISSE (Matter et al. 2016).