tokens: Acknowledgments We thank C. Lang and D. Ludovici for sharing their reduced, high resolution VLA data covering the position of PSR J17462850, and G. Desvignes, R. Eatough, P. Esposito, D. Schnitzeler and A. Siemion for useful discussions. JD was supported by a Sofja Kovalevskaja Award from the Alexander von Humboldt Foundation of Germany. N. Degenaar acknowledges support via a Vidi grant from the Netherlands Organization for Scientific research (NWO) and a Marie Curie fellowship from the European Commission under contract no. FP-PEOPLE-2013-IEF-627148. J. Deneva was supported by the NASA Fermi program. MK and RK acknowledge the financial support by the European Research Council for the ERC Synergy Grant BlackHoleCam under contract no. 610058. The Parkes radio telescope is part of the Australia Telescope, which is funded by the Commonwealth Government for operation as a National Facility managed by CSIRO.
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