Thermal dileptons from coarse-grained transport as fireball probes at SIS energies Tetyana Galatyuk, Paul M. Hohler, Ralf Rapp, Florian Seck and Joachim Stroth Eur. Phys. J. A, 52 5 (2016) 131 Published online: 16 May 2016 DOI: 10.1140/epja/i2016-16131-1