Precision and accuracy of single-molecule FRET measurements—a multi-laboratory benchmark study by Hellenkamp, B, Schmid, S, Doroshenko, O, Opanasyuk, O, Kühnemuth, R, Rezaei Adariani, S, Ambrose, B, Aznauryan, M, Barth, A, Birkedal, V, Bowen, M, Chen, H, Cordes, T, Eilert, T, Fijen, C, Gebhardt, C, Götz, M, Gouridis, G, Gratton, E, Ha, T, Hao, P, Hanke, C, Hartmann, A, Hendrix, J, Hildebrandt, L, Hirschfeld, V, Hohlbein, J, Hua, B, Hübner, C, Kallis, E, Kapanidis, A, Kim, J, Krainer, G, Lamb, D, Lee, N, Lemke, E, Levesque, B, Levitus, M, McCann, J, Naredi-Rainer, N, Nettels, D, Ngo, T, Qiu, R, Robb, N, Röcker, C, Sanabria, H, Schlierf, M, Schröder, T, Schuler, B, Seidel, H, Streit, L, Thurn, J, Tinnefeld, P, Tyagi, S, Vandenberk, N, Vera, A, Weninger, K, Wünsch, B, Yanez-Orozco, I, Michaelis, J, Seidel, C, Craggs, T, Hugel, T