multimesssenger fluxes from TXS 0506+056. The gray, blue, and red data points show the multiwavelength flux observations, according to the legend shown above. The colored bands show the range of the best-fit point source neutrino flux at the 68% confidence level, derived from public IceCube data, assuming two different signal spectral shapes. Top: The signal spectrum is assumed to be peaky, as predicted by leptohadronic blazar models; the template shape considered for all sources is shown as a green curve. The green band shows the allowed peak positions at the 68% confidence level. These are the data used in this work to constrain the model. Bottom: The signal spectrum is assumed to be a power law, as exemplified by the purple line. The purple band shows the point source neutrino fluxes from this blazar compatible with the data at the 68% confidence level. This was the analysis performed in Paper IV.