Qualitative edge-on view of the BLR geometry suggested for NGC 1566 (not to scale and the height of the BLR above the disk plane is largely exaggerated for clarity). The blue and red color of the disk vaguely represents the transition from a hotter inner to a cooler outer accretion disk. The BLR has a flattened distribution, with O I and Ca II being emitted close to the midplane of the accretion disk. Hβ is emitted at greater scale height. He I is emitted at shorter radial distance from the ionizing source.