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Experimental PELDOR data (black) and fits (gray) on the NS1 ED of PR8, Udn, and 1918 (top). For clarity, traces and fits of Udn and 1918 have been shifted by −0.2 and −0.4 on the y-axis, respectively. Distance distribution for PR8 in comparison with crystal helix–helix (middle) and strand–strand (bottom) dimer models.
