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Temperature dependencies of the proton hfs constants for nitroxide In2 (filled squares) and In3 (open circles) (a), and In4 (b). Data for nitroxide In3 at temperatures above 325 K is unavailable due to radical decomposition. For nitroxide In4, two different proton hfs constants, aH1 and aH2 (see Table 1), are denoted by filled squares and open circles, respectively
