Ly ² forest also with some lines of heavy elements

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Ly ² Forest , also with some lines of heavy elements 17.2 < log N (HI) < 20.3 - Lyman Limit log N (HI) = 17.2 is just enough to make the Ly limit at 911.753 Å optically thick ( ² phion (H) = 6.3x 10 -18 cm -2 ). Similar to so-called metal line systems, where Ly ² is unavailable. log N (HI) > 20.3 - Damped Ly ² Absorption - Large HI columns typical of gas-rich galaxies like the Milky Way.
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