Maximum correlation ρ(v_sm,v₈₀) (left) and corresponding FWHM of Gaussian kernel (right) used to smooth the actual flow map v_sm. For both cases, the maps were averaged over one hour. The LCT flow maps were computed for images with an image-scale of 80 km pixel^-1 matching Hinode G-band images, using time cadences of Δt = 10−480 s and Gaussian sampling windows with an FWHM = 400−1800 km, shown here as 8 × 8 square blocks. Gray blocks indicate parameters, where the linear correlation did not deliver meaningful results.