Effective Doppler dimming coefficient of the resonantly scattered H I Lyα line (solid lines) and absolute value of its derivative with respect to the outflow speed (dashed lines), calculated at the heliocentric distance r = 2.5 R⊙, on the plane of the sky of the observer, for a polar coronal hole (CH) with THI = 2.2 MK averaged along the LOS (red lines), and r = 4.0 R⊙ for an equatorial streamer (STR) with THI = 1.6 MK averaged along the LOS (green lines).
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