This article has an erratum: [https://doi.org/10.1051/0004-6361/201629932e]
ψ Per: azimuthally averaged visibility data of Dougherty & Taylor (1992, black points with error bars) and a Gaussian fit to them (thick black line, FWHM of 74 mas corresponding to 518 Re) over-plotted with the visibility curves derived from our azimuthally averaged models with several different disk sizes indicated in the legend. The dotted line shows the visibility curve of a point source (visibility equal to unity with increasing baseline length).
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