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l(r, w, f, v) = r / v * (w/2 / tan( f/2*pi/180)) for r = 6.5, w = 3840, f = 49, v = 400
l(r, w, f, v) = r / v * (w/2 / tan( f/2*pi/180)) for r = 6.5, w = 3840, f = 49, v = 400
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