Scattering as a function of DM of Apertif FRBs compared to Galactic pulsars. The measured Apertif τ_sc as a function of extragalactic DM is shown as purple diamonds (greater transparency for upper limits). The cyan circles correspond to the measured scintillation converted to scattering as a function of the expected Galactic DM. The grey dots are the known pulsar τ_sc at 1370 MHz as a function of measured DM. Two τ_sc–DM relations are shown, from Bhat et al. (2004, yellow line) and Cordes & Chatterjee (2019, blue line with shaded region).