Intensity of [C II] (blue), [O I] (red), and [C I] (green) predicted for J-type shock models with a preshock density of n = 10³ cm⁻³ and n = 10⁴ cm⁻³ by the Paris-Durham code. The horizontal lines indicate the observed [C I] intensity and 3 σ upper limits for [C II] and [O I]. This shows that the [C II] and [O I] non-detections in Musca are consistent with shocks and that the [C I] brightness from the shock is not brighter than the total observed [C I] brightness in Musca.