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Swartz, Elina Lindfors, Elisabetta Cavazzuti, Emmanouil Angelakis, Enrico Costa, Ettore Del Monte, Fabian Kislat, Fabio La Monaca, Fabio Muleri, Fabrizio Tavecchio, Fei Xie, Fiamma Capitanio, Francesco Massaro, Francesco Tombesi, Francisco Jose Aceituno, Fr\\'ed\\'eric Marin, Garrett K. Keating, George G. Pavlov, Giacomo Bonnoli, Giorgio Matt, Gloria Spandre, Henric Krawczynski, Herman L. Marshall, Ikuyuki Mitsuishi, Immacolata Donnarumma, Ioannis Liodakis, Ioannis Myserlis, Iv\\'an Agudo, Jacco Vink, Javier A. Garcia, Jeffery J. Kolodziejczak, Jeremy Heyl, John Rankin, Jorge Otero Santos, Juan Escudero, Juri Poutanen, Kari Nilsson, Kinwah Wu, Kiyoshi Hayashida, Laura Di Gesu, Luca Baldini, Luca Latronico, Lucio A. Antonelli, Mark Gurwell, Martin C. Weisskopf, Matteo Bachetti, Matteo Perri, Maura Pilia, Melissa Pesce-Rollins, Michal Dov\\v{c}iak, Michela Negro, Niccol\\`o Bucciantini, Niccol\\`o Di Lalla, Nicholas E. Thomas, Nicola Omodei, Oliver J. Roberts, Paolo Soffitta, Patrick Slane, Philip Kaaret, Pierre-Olivier Petrucci, Pouya M. Kouch, Raffaella Bonino, Ramprasad Rao, Riccardo Ferrazzoli, Riccardo Middei, Roberto Taverna, Roberto Turolla, Roger W. Romani, Ronaldo Bellazzini, Sergey S. Tsygankov, Sergio Fabiani, Shuichi Gunji, Silvia Zane, Simone Castellano, Simone Maldera, Simonetta Puccetti, Stefano Bianchi, Stefano Ciprini, Stephen D. Bongiorno, Stephen L. O'Dell, Steven R. Ehlert, Svetlana G. Jorstad, Takao Kitaguchi, Teruaki Enoto, Toru Tamagawa, Tsunefumi Mizuno, Victor Casanova, Victor Doroshenko, Vladimir Karas, Wataru Iwakiri, Wayne H. Baumgartner, Yuri Evangelista, Yuzuru Tawara","submitted_at":"2023-10-02T21:02:05Z","abstract_excerpt":"We present polarization measurements in the $2-8 \\thinspace \\mathrm{keV}$ band from blazar 1ES 0229+200, the first extreme high synchrotron peaked source to be observed by the Imaging X-ray Polarimetry Explorer (IXPE). 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