Apparent superluminal core expansion and limb brightening in the candidate neutrino blazar TXS 0506+056

We are especially thankful to N. MacDonald for valuable comments. We also acknowledge C. Breu for support during the data calibration. We thank the anonymous referee for the rapid and very constructive comments to the manuscript. The Very Long Baseline Array is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. F. K. was supported as an Eberly Research Fellow by the Eberly College of Science at the Pennsylvania State University. This research has made use of National Aeronautics and Space Administration’s (NASA) Astrophysics Data System, and of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with NASA.