We justify the practical use of the Shuvaev integral transform approach to calculate the skewed distributions, needed to describe diffractive processes, directly from the conventional diagonal global parton distributions. We address doubts which have been raised about this procedure. We emphasise that the approach, on the one hand, satisfies all theoretical reqirements, and, on the other hand, is consistent with DVCS data at NLO. We construct an easily accessible package for the computation of these skewed distributions.

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We describe how in the small x regime skewed parton distributions can be obtained from the diagonal ones in a parameter free way, using the so-called Shuvaev transform. Numerical results based on input from global fit partons are presented, and an easy-touse package for fast interpolation with grid files is provided by us. We briefly comment on the comparison with another approach to determine skewed partons.

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