LCT divergence map computed for input parameters: image scale 80 km pixel^-1, time cadence Δt = 60 s, Gaussian sampling window with an FWHM = 1200 km, and averaging time ΔT = 1 h. Overplotted are the contours of the corresponding one-hour averaged divergence of the actual flow velocity smoothed by a Gaussian with an FWHM = 1266 km. Orange (solid) and blue (dashed) lines indicate positive and negative (± 1, ± 2  and ± 3 × 10^-3 s^-1) divergence, respectively.