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I actually don't think think$^{\dagger}$ that this example is in Laumon/Moret-Bailey, but Jonathan Wang's senior thesis is a detailed write up in the style of LMB (and in English!) of this fact: http://math.harvard.edu/theses/senior/wang/wang.pdf.

$^{\dagger}$ Edit: I stand corrected!

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I actually don't think that this example is in Laumon/Moret-Bailey, but Jonathan Wang's senior thesis is a detailed write up in the style of LMB (and in English!) of this fact: http://math.harvard.edu/theses/senior/wang/wang.pdf.