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Plot of stellar luminosity vs. disc temperature for a sample of 97 spatially resolved debris discs, taken from Marshall et al. (2021a). The dust temperature is plotted as a ratio with the blackbody temperature (i.e. Tdust/Tbb) at the observed location of the dust disc around each star. A general trend can be seen that the disc temperature tends toward the blackbody temperature for more luminous stars. This indicates that the dust grains responsible for the observed emission are larger around more luminous stars, as expected from dust grain removal through radiation pressure.