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References 19 and 20 in the online Supporting Material,
19. Restrepo, J. G., and A. Karma. 2009. Spatiotemporal intracellular calcium dynamics during cardiac alternans. Chaos. 19:037115l
20. Restrepo, J. G., J. N. Weiss, and A. Karma. 2008. Calsequestrin-mediated mechanism for cellular calcium transient alternans. Biophys. J. 95:3767–3789,
were originally included in the main text Methods section but were moved to the Supporting Material during revision. These references introduced a similar general modeling approach to the one presented here, in a different context of calcium alternans. References to these articles should have been retained in the main text as well, and we apologize for this omission.