The supernova-regulated ISM - IV. A comparison of simulated polarization with Planck observations M. S. Väisälä, F. A. Gent, M. Juvela and M. J. Käpylä A&A, 614 (2018) A101 Published online: 22 June 2018 DOI: 10.1051/0004-6361/201730825