tokens: G.M.W. acknowledges discussions with Frank Rieger, who pointed out the numerical error in the expression for the particle gyro-radius in Equation (99) of Webb et al. ( 2018a ). We thank the referee for a very thorough report and for pointing out inconsistencies and errors in the original manuscript. G.M.W. and G.L. were supported in part by NASA grant 80NSSC19K0075. P.M. acknowledges the support of a NASA Earth and Space Science Fellowship Grant 16-HELIO16F-0022. J.A.L.R. is supported in part by NASA grants NNX15A165G, 80NSSC19K0276, and NSF-DOE grant PHY-1707247. G.P.Z. has been supported in part by the NSF EPSCoR RII-Track-1 Cooperative Agreement OIA-1655280 and an NSF/DOE Partnership in Basic Plasma Science and Engineering via NSF grant PHY-1707247. A.F.B. acknowledges valuable insights and discussions with Prof. Peter Biermann on UHECR and candidate sources and radio galaxies.
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