Acknowledgement
The RadioAstron project was led by the Astro Space Center of the Lebedev Physical Institute of the Russian Academy of Sciences and the Lavochkin Scientific and Production Association under a contract with the State Space Corporation ROSCOSMOS, in collaboration with partner organizations in Russia and other countries. This work is based on observations carried out using Korean VLBI Network antennas operated by Korean Astronomy and Space Science Institute (KASI). It is partly based on observations with the Medicina (Noto) telescope operated by INAF - Istituto di Radioastronomia. This work is also based in part on observations carried out using the 32-meter radio telescope operated by Torun Centre for Astronomy of Nicolaus Copernicus University in Torun (Poland) and supported by a Polish Ministry of Science and Higher Education SpUB grant.
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