Emission spectrum of WASP-12b as measured by HST/WFC3 (absolute measurement) compared to global circulation models and black-body emission curves. The Solar (red) and 2× Optical Opacity (pink) models are self-consistent forward models. The remaining models include post-processing changes to the solarmodel. No dissociation (blue) has no dissociation of molecules, No H- (purple) has no H- opacities, No molecules (grey) has no molecular opacities and therefore mimics an H- continuum spectrum.