Reconstruction of a helical prominence in 3D from IRIS spectra and images B. Schmieder, M. Zapiór, A. López Ariste, P. Levens, N. Labrosse and R. Gravet A&A, 606 (2017) A30 Published online: 03 October 2017 DOI: 10.1051/0004-6361/201730839