Left: acoustic cut-off period as function of the inclination of the magnetic field at the photosphere (solid line) and at the canopy level (dotted line). Right: turning height (solid line) and canopy height (dashed line) versus the attack angle (inclination at the canopy height). For reference, the estimated HOF (Leenaarts et al. 2006) of photospheric (± 0.70 Å from line center) and chromospheric (± 0.35 Å from line center) Hα line wings are included (horizontal dotted and dashed lines, respectively).
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