Extended Data Fig. 1: Newton plots for higher coincidence conditions.

Newton plots for higher coincidence conditions. (A) Three-fold [I⁺ + N⁺ + C⁺], (B) four-fold [I⁺ + N⁺ + C⁺ + H⁺], (C) six-fold [I⁺ + N⁺ + 3 × C⁺ + H⁺], and (D) eight-fold [I⁺ + N⁺ + 3 × C⁺ + 3 × H⁺] coincidence analysis. Note that, in contrast to Fig. 1, the ion intensity is plotted as counts. Therefore, the nitrogen ion appears overestimated by a factor of 5 as compared to the carbon ions. In all cases, one nitrogen ion was detected and is plotted, while only one of the five different carbon ions is plotted (even in cases where more than one carbon ion was detected).