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Incorrect alpha value in the plot_theta2_from_dl3 notebook #1353

@mdebony

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@mdebony

The alpha value used for computation of significance are wrong in the plot_theta2_from_dl3 notebook.
For example with the Crab dataset of the lst school, the alpha value in the notebook are around 0.06 while they should be around 0.33 (3 off regions).
The reason for this is than off counts a counted multiple time, N_observation/(N_Wobble2) to be exact. As the alpha value is computed on the normalization part of the theta 2 counts, it cause a multiplication of the alpha value by (N_Wobble2)/N_observation.

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