Velocity in the radial direction (left) and azimuthal direction (right) along the equator of the MACHO 80.7443.1718 surface at periastron as a function of the longitude. The colors indicate results from the calculations using the code TIDES-1vv with λ = 0.01 (blue); and with λ = 1 (magenta). The sub-binary longitude is at φ = 0°. Each dot in the plot correspond to a grid point. The smaller viscosity models (λ = 0.1) display wave-like velocity structures along the stellar circumference.