Compatibility of the Co³RaL model data (peak fluxes and FWHM in mJy and km s^–1, respectively) with the observational ones for H (upper panel) and He I (lower panel) in PN IC 418. The dots represent the peak flux and FWHM of each observed emission line obtained with the Gaussian fit using the available procedure in CLASS with the respective errors, while the crosses represent the peak flux and FWHM values simulated by Co³RaL. All data are separated by frequency bands. The colored regions on the peak flux plots represent the ±1 σ deviation of the data at each frequency band. The colored regions on the FWHM plots represent the ±1 σ deviation from the observational FWHM mean (see Section 2 for more details).