Weak lines at solar disk center, μ = 1. Shown are the line profiles and bisectors from the Jungfraujoch atlas (left). Numerous lines of comparable strength show similar behavior in both the nonmagnetic case (center) and in the 240 mT = 2400 G magnetic simulation (right). Wavelengths in observational atlases are affected by the solar gravitational redshift of 635 m s⁻¹ and possible errors in laboratory wavelengths.