FIRAS/WMAP diffuse MW spectrum fitted using the TLS model: total in red (solid), DCD process in light blue (long dash), and TLS processes: resonant absorption in green (dash), hopping relaxation in dark blue (dot), and tunneling relaxation in orange (dash-dot), with the best-fit parameters (top panel) and standard parameters (bottom panel). The gray line (dash-dot-dot-dash) corresponds to free-free emission, and the brown line (thick dash) to a λ^α power law.