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For the magnetic combination the ( N − 1)th Mellin moment ( N - odd) is the the polyno- mial of ξ of order N − 1 

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The corresponding set of coefficients h g ( M ) N,k ( t ) is expressed through the generalized form factors B g ( M ) nl as follows 

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Gluon GPDs H g ( E,M $^{)}$( x, ξ, t ) are normalized according to: 

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0 Here M g $_{2}$( t ) stands for the t -dependent momentum fraction carried by gluons in the nucleon; J $^{g}$( t ) denotes the t -dependent fraction of angular momentum carried by gluons and d g $_{1}$( t ) is the first coefficient of Gegenbauer expansion of the gluon D -term (52). 

## IV. THE PROPERTIES OF H g ( E,M $^{)}$( x, ξ, t ) IN THE DUAL PARAMETRIZATION 

To sum up the formal series for the electric and magnetic combinations of gluon GPDs (18), (19) we employ the techniques developed in [15] (see also discussion in [22]). Some of the additional technical details specific for the gluon case are presented in the Appendix A. 

To proceed with the summation of the formal series (18), (19) we introduce two sets of gluon forward-like functions G g ( E ) 2 ν and G g ( M ) 2 ν , whose Mellin moments generate electric and magnetic generalized form-factors B g ( E,M ) nl ( t ): 

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