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Fig. A.1.

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Evolution of the ratio of the combined [O I] λλ 6300,  6364 and [N II] λλ 6548,  6583 fluxes with that of [Ca II] λλ 7291,  7323 for models he2p6, he4p0, he5p0, he6p0, he8p0, and he12p0. These curves are analogous to the r − i color curves shown in Figs. 2 and 4.

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