Height formation of bright points observed by IRIS in Mg II line wings during flux emergence M. Grubecka, B. Schmieder, A. Berlicki, P. Heinzel, K. Dalmasse and P. Mein A&A, 593 (2016) A32 Published online: 06 September 2016 DOI: 10.1051/0004-6361/201527358