Figure 8.

Sample containing the NO–NO, NO–Gd, and Gd–Gd rulers mixed in a $\mathrm{1}:\mathrm{1}:\mathrm{2}$ ratio. The legend is the same as in Fig. . $X_{\mathrm{3}}$   is a Gd–Gd crosstalk signal in the NOGd DEER channel in presence of a NO–Gd distance.