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  • $\begingroup$ It is caused by the superfluous VectorScale. B.t.w. this is superseeded in version 12.1 (see the manual) $\endgroup$ Commented Apr 6, 2021 at 12:32
  • $\begingroup$ @DanielHuber if I remove the VectorScale it becomes even weirder! I also am using version 12.0, though I don't know if that's enough to make a difference $\endgroup$ Commented Apr 6, 2021 at 13:52
  • $\begingroup$ I have 12.1. Is my code running at your place? $\endgroup$ Commented Apr 6, 2021 at 14:16
  • $\begingroup$ It runs, it just doesn't look right! I've got some over vectorplot functions that don't have piecewise functions in them and they work fine with the VectorScale-> {Small, 0.1, Automatid}, so I'm not sure what's made it so unhappy! $\endgroup$ Commented Apr 6, 2021 at 15:11
  • $\begingroup$ I think I've figured out the issue, though haven't quite worked out how to fix it. Basically the system has a singularity at low levels of l and x2 and I need to fiddle with the scaling to get that massive arrow to disappear $\endgroup$ Commented Apr 7, 2021 at 10:51