tokens: We are grateful to Andrej Dundovic for useful discussions as well as the comments of the unknown referee that helped to improve the original version of the paper. L.S., A.F., and B.E. acknowledge financial support from the MERCUR project An-2017-0009. Software: CRPropa3 (Alves Batista et al. 2016 ), NumPy (van der Walt et al. 2011 ), Matplotlib (Hunter 2007 ), SymPy (Meurer et al. 2017 ), Pandas (McKinney 2010 ).
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