Form of the wavefronts in the equatorial and polar planes. Top: contour plots of the normalized radial velocity in the equatorial (left) and polar (right) planes zoomed in the upper region of the radiative zone. Bottom: surface plots corresponding to the region delimited by the black rectangles in the top panel that show the amplitude of the wavefronts varying with longitude (left) and colatitude (right). The velocity has been divided by its rms value at each radius, in order to visualize the form of the wavefront despite the attenuation of the amplitude.