Uniform disk diameters θ_UD derived from the VEGA/CHARA E1E2 data plotted as a function of the pulsation phase (blue crosses). The S1S2 data (corresponding to four different pulsation phases, see Table 3) were merged and the corresponding mean θ_UD is represented by a black horizontal line together with the 1σ uncertainty (blue dashed zone). The uniform disk angular diameter curve from FLUOR/CHARA in the K band (Mérand et al. 2005) is also shown for comparison. The red crosses and the light blue squares show the K band and R band UD angular diameter curves, respectively, as predicted from the SPIPS code (Merand et al. 2015a).