Spectral decomposition for source L17. The solid green line is the fitted model. Blue lines above the continuum are PAH features; violet lines are spectral lines. Thin grey lines represent thermal dust continuum components. The thick red line shows the total continuum (stars+dust). The dotted black line shows the extinction (e^−τλ,  = 1 for no extinction). In this example, the top axis is labelled in observed wavelength. The redshift is z_PAH = 1.959. Spectral decompositions for the other sources are presented in Appendix B.