Left: Measured fringe visibility (﹩V^{2}﹩) of V838 Mon as a function of projected baseline length measured in units of the observing wavelength (2.2 μm). Different symbols are used for different nights. Filled symbols are used for data taken with the southwest baseline; open symbols indicate northwest baseline data. Best‐fit uniform‐disk models are shown for combined and single‐baseline data sets. The data show that the emission is resolved and is inconsistent with a circularly symmetric emission source. Right: Measured fringe contrast as a function of source hour angle, together with the best‐fit models. A binary or inclined disk model is required to account for the data from both baselines. Note that the northwest‐baseline data have been moved up by 1.0 for clarity.