Source data files for: "Alternative transcription cycle for bacterial RNA polymerase" Timothy T. Harden1, Karina S. Herlambang2†, Mathew Chamberlain1†, Jean-Benoît Lalanne­3,4, Christopher D. Wells5, Gene-Wei Li3, Robert Landick6, Ann Hochschild5, Jane Kondev1, and Jeff Gelles2 Departments of 1Physics and 2Biochemistry, Brandeis University, Waltham, MA 02454, USA Departments of 3Biology and 4Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA 5Department of Microbiology, Blavatnick Institute, Harvard Medical School, Boston, MA, 02115 USA 6Department of Biochemistry and Department of Bacteriology, University of Wisconsin, Madison, WI 53706, USA †These authors contributed equally and are listed in the order determined by a coin toss.