x$_{Bj}$ regime is governed by quark exchange mechanism and is known to be dominated by the contribution due to the imaginary part of the amplitude: The imaginary part of the leading order DVCS amplitude is given by Im A$_{DV CS}$ ( ξ, t = 0) = πH$_{DV CS}$ ( ξ, ξ, t = 0), where H$_{DV CS}$ is the combination of the singlet unpolarized quark GPDs H$_{DV CS}$ = 4 $_{9}$H $^{u}$+ 1 $_{9}$H $^{d}$. The parameter ρ 2 in (71), (72) refers to the small correction due to the real part of the amplitude. Since the virtual photon is assumed to be transversely polarized, in the case of DVCS it is also to be taken transversely polarized in the DIS amplitude in (71). The text book expression for the transversely polarized DIS cross section reads: Now, since for small x$_{Bj}$ the skewness parameter is given by ξ ≃ x$_{Bj}$/ 2, the definition (71) for the observable R can be rewritten as Contrary to the original statement of Ref. [41], the model without skewness corresponds to R = 2 α $^{q}$r q ≃ 2 . Thus, as it is emphasized in [13, 14], the results of the experimental measurements of R performed by H1 Collaboration [41] presented on Figure 2 unambiguously allude to no skewness effect for small x$_{Bj}$ . Let us now discuss skewness effect in the framework of the dual parametrization. Em- ploying the results of the previous section and of [9] we compute the skewness effect for small ξ in the minimalist dual model in which only the contributions of the forward like functions Q ( E,M ) 0 ( x ) and G ( E,M ) 0 ( x ) assuming Regge like behavior (67), (68) of input electric and magnetic combinations of parton densities. The corresponding result reads: It is extremely instructive to compare the skewness effect (76) in the minimalist dual model to that in the commonly used version of RDDA with the same asymptotic behavior 22 σ$_{DV CS}$ ( x$_{Bj}$ ∼ 0 , Q $^{2}$) ≃ α 2 $_{e.m.}$πx 2 Bj Q 4 | Im A$_{DV CS}$ ( ξ, t = 0) | 2 1 b ( Q $^{2}$) (1 + ρ $^{2}$) . (72) σ$_{T}$ ( $_{γ}$∗$_{p}$ → X ) ≃ 4 π $^{2}$α$_{e.m.}$ F$_{2}$ ( x$_{Bj}$, Q $^{2}$) Q 2 = 4 π $^{2}$α$_{e.m.}$ x$_{Bj}$H$_{DV CS}$ ( x$_{Bj}$, ξ = 0) Q 2 . (73) R( Q $^{2}$, W $^{)$_{x}$$_{Bj}$}$∼ 0 ≃ H$_{DV CS}$ ( x$_{Bj}$ 2 , x$_{Bj}$ 2 , t = 0 ) H$_{DV CS}$ ( x$_{Bj}$, ξ = 0 , t = 0) . (74) r q ( E,M ) Q$_{0}$ ≡ H q ( E,M $^{)}$( ξ, ξ ) H q ( E,M $^{)}$( ξ, 0) ∣ ξ ∼ 0 ≃ 2 α $^{q}$Γ( α q + 3 $_{2}$) Γ( 3 $_{2}$)Γ(2 + α $^{q}$) ≈ 3 / 2 for α q ≈ 1 ; (75) r g ( E,M ) G$_{0}$ ≡ H g ( E,M $^{)}$( ξ, ξ ) H g ( E,M $^{)}$( ξ, 0) ∣ ξ ∼ 0 ≃ 2 α $^{$^{g}$+1}$Γ( α g + 3 $_{2}$) Γ( 3 $_{2}$)Γ(3 + α $^{g}$) ≈ 1 for α g ≈ 1 . (76)