The new Göttingen Fabry-Pérot spectrometer for two-dimensional observations of the Sun K. G. Puschmann, F. Kneer, T. Seelemann and A. D. Wittmann A&A, 451 3 (2006) 1151-1158 Published online: 04 May 2006 DOI: 10.1051/0004-6361:20054487