The identification of solar lines in the photographic infrared region is discussed. Sample multiplets of C i, N i, O i, Na i, Al i, Si i, Ti i, and Fe i are listed to illustrate the consistency of term intervals within multiplets, when solar wave numbers are substituted for laboratory values. These data furnish an excellent criterion of both the precision of the solar data and the correctness of the assigned identifications. Solar lines produced by more than one contributor, i.e., blends, can be detected by irregularities in the solar term intervals within multiplets.
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