The fit of the UHECR secondary synchrotron model to the spectrum of 1ES 0229+200, assuming a mean strength of the magnetic field in the magnetised region, in the range 6−316 nG. Here L_cr,iso = 10^46.5 erg s^-1 has been assumed. Fermi/LAT data points for this source here and throughout have been adapted from Vovk et al. (2012). The model spectra shown account for the attenuation by the EBL, for which the model of Kneiske & Dole (2008) has been considered.