Diameter measurements of W Hya over a wide wavelength range with different models reported by various authors. In addition to the N-band full data set diameter (thick blue line; all 75 observations), the diameters at maximum light (upper thin blue line) and minimum light (lower thin blue line) from this work are shown as well (FDD  ≈  1.15 UD  ≈  1.68 Gaussian). See Table 3 for more details.