Electron density at different position angles (PA) for heights of 1.1 R⊙ and 1.3 R⊙. Coronal holes measure a density of ~3 × 107 cm-3 at 1.1 R⊙ and ~1 × 107 cm-3 at 1.3 R⊙, while the active regions reach a density of ~2 × 108 cm-3 at 1.1 R⊙ and ~9 × 107 cm-3 at 1.3 R⊙.
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