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Ly²Forest, also with some lines of heavy elements• 17.2 < logN(HI) < 20.3 - Lyman Limit logN(HI) = 17.2 is just enough to make the Ly limit at911.753 Å optically thick (²phion(H) = 6.3x 10-18cm-2).Similar to so-called metal line systems, where Ly²isunavailable. • logN(HI) > 20.3 - Damped Ly²Absorption -Large HI columns typical of gas-rich galaxies like the Milky Way.
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