The available HD 220242 photometry (aqua and green circles) plotted alongside the synthetic photometry derived from convolving the best-fitting atmospheric model with the bandpass of each instrument, plotted as purple diamonds. Photometric points in green were not used in the fit, as ARIADNE uses photometric points redder than W2 solely to visualize potential IR excess; they are included only for completeness. The BTSettl-AGSS2009 model (gray line) with characteristics most similar to those found in the ARIADNE fit is included to guide the eye, but is not expected to be identical to the photometry. Below: the residuals between the synthetic and observed photometry.