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grb absorption spectroscopy - Inaf

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GRB 050730<br />

Fine structure transitions - the ion Si II and the atom O I<br />

Si II 1260, Si II 1304, Si II 1526 doublets and O I 1302 triplet<br />

SiII*<br />

OI*<br />

Only components 2 and 3 are present in the excited fine<br />

structure features

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