Cumulative γ-ray (blue data points) spectrum and neutrino flux upper limit (red) for the Northern Hemisphere blazars. The blue shaded band shows the spectrum of extragalactic sources resolved by Fermi telescope from Ackermann et al. (2015). The black hatched bow-tie shows the IceCube astrophysical neutrino flux in the muon neutrino channel from IceCube Collaboration et al. (2016b). The grey dashed line shows a model neutrino spectrum for a PIC model from Tchernin et al. (2013).