The Lyman-break galaxy selection technique relies on the fact that radiation at higher energies than the Lyman limit at 912 expansion of the Universe.
2.
Therefore, the lines seen in the image above are the wavelengths corresponding to " n " = 2 on the right, to " n " = " on the left . There are infinitely many spectral lines, but they become very dense as they approach " n " = " ( the Lyman limit ), so only some of the first lines and the last one appear.
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