Observed visibilities v₁ for the Kepler public data set of red giants, as a function of ν_max. Values for stars showing depressed mixed modes are emphasized with large diamonds and compared to the computed visibilities: large dark triangles for the low-coupling case (Eq. (16), as in Unno et al. 1989; Fuller et al. 2015) are very close to black squares for the strong-coupling case (Eq. (20)). Gray lines connect the observed and modeled values.