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possible error in the computations of DIS FKtables  #37

@lucarottoli

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@lucarottoli

I have experienced some problems in the generations of the DIS FKtables using a new resummed theory (200) that @enocera and I are testing. In particular, at high values of Q some of the results are off by several order of magnitudes. I think I traced the error to the Q range with which APFEL is initialized; currently, Qmax = sqrt(Q2max), where Q2max is the maximum value of Q2 in the dataset. I tried to raise the Qmax value and the errors are not there anymore. I would push a pull request which fixes this error by setting the Qmax range to 2*Qmax to avoid rounding errors

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