@brief KORC derived type that contains information about a given Gamma distribution function @f$f_\Gamma(x,\kappa,\theta)@f$.
@details We write a given Gamma distribution function in terms of its shape factor @f$\kappa@f$ and scale factor
@f$\theta@f$, so that:
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types it contains as a components, with a label listing the name(s) of
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