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Babel  and hyphenation patterns for english, usenglishmax, dumylang, noh
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Underfull \hbox (badness 10000) in paragraph at lines 43--45

! Missing $ inserted.
 
                $
l.51 ...re the transport scattering rate is 1/tau_
                                                  tr = 2 \pi \lambda T, wher...

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! Emergency stop.
 
                $
l.51 ...re the transport scattering rate is 1/tau_
                                                  tr = 2 \pi \lambda T, wher...

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