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The spectrum of a hypothetical atom is shown in the figure. Three distinct spectral series are...

The spectrum of a hypothetical atom is shown in the figure. Three distinct spectral series are shown, with the center series corresponding to transitions to a final state of nf=3. The indicated spectral line corresponds to the transition from an initial state of ni=5 to the final state nf=3. Which of the lettered spectral lines corresponds to the transition from ni=7 to nf=4?

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