Observed maximum intensities of various tracers (colored crosses) compared with model predictions (symbols with error bars). Squares show the best-fit model from the minimization described in Appendix C, while circles represent the model obtained in Section 4.4 using literature parameters with G₀ = 100. All tracers are well reproduced, except for H₂O, for which the models over-predict the observed maximum intensity by about an order of magnitude. The error bars of 40% on models represent geometrical uncertainties and the complexity of the parameter space.