Bisectors computed using the image of Betelgeuse inferred to best fit the linear polarization signal observed on December 20, 2013. Parabolic gradients reducing the radial velocity are used, with various values of β as indicated. The maximum velocities at each point over the disk are reduced to 70% of the value inferred from fitting the linear polarization signal, to avoid the broadening of the profiles in the cases with small β, thus keeping the computed profiles as narrow as the ones observed.