Rate of the reaction ¹⁶O(p,α)¹³N, as a function of temperature in units of 10⁹ K, from different compilations: Caughlan & Fowler (1988, CF88), Wagoner (1969, WAG69), and Sallaska et al. (2013, STARLIB). The uncertainty listed in the STARLIB compilation is plotted as a vertical error bar. The shaded band shows the uncertainty on the rate as determined using measured calcium-to-sulfur and argon-to-sulfur mass ratios in SNRs (see text for details).