Illustration of fit with PAHFIT and the PDR pack applied to the Orion Bar DF1 template spectrum over the 3.1–26 μm wavelength range using the alternate continuum model. The gaps in the data are wavelength sections that were omitted (Sect. 2.3). The lower part of each panel shows the fractional residuals. The fits to narrow lines in the 3.1–3.8 μm range are included in the total model curve but not shown individually. The uncertainties on the data are not shown as they are very small, and the residuals are outside the 1σ range for most of the data points.