Fig. 4
Horizontal flow speed (left) and azimuth maps (right) measured using Gaussian kernels with 64 × 64 pixels and various FWHM. The FWHM of 7.5, 15, 22.5, and 30 pixels correspond to 600, 1200, 1800, and 2400 km on the solar surface, respectively. The bottom row depicts smoothed versions of the FWHM = 1200 km speed and azimuth maps. The color coding is the same as in Fig. 2.
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