Departures from 1 of the directional average of the inverse geometric magnification ⟨μ⁻¹(z)⟩_d and of the inverse observable magnification at constant redshift z. Dots indicate numerical averages over HEALPIX maps, while error bars allow for super-sample and Poisson variance; see Appendix D.1 for their expressions. The full-sky variance on ⟨μ⁻¹(z < 0.5)⟩_d does not contain super-sample variance. The three vertical dashed lines indicate the limits of our three light cones: full-sky (z < 0.5), intermediate narrow (0.5 < z < 2), and deep narrow (2 < z < 10).