Fast-track revision published on 16 June 2014
One of the key features of Living Reviews is that its articles are kept up-to-date by their authors. Errata and fast-track revisions of important new research developments are added directly to the original review and marked throughout the article.
I forgot to include one of the new, very relevant telescopes in my discussion in Section 4.1, the GREGOR telescope.
Changes in detail:
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|Added mention of GREGOR and GRIS and two respective references.|