Three-dimensional modeling of chromospheric spectral lines in a simulated active region Johan P. Bjørgen, Jorrit Leenaarts, Matthias Rempel, Mark C. M. Cheung, Sanja Danilovic, Jaime de la Cruz Rodríguez and Andrii V. Sukhorukov A&A, 631 (2019) A33 Published online: 16 October 2019 DOI: 10.1051/0004-6361/201834919