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The higher twist contributions to the deeply inelastic structure functions$F_2^{p}(x,Q^2)$ and $F_2^{d}(x,Q^2)$ for larger values of the Bjorken variable$x$ are extracted extrapolating the {twist--2} contributions measured in thelarge $W^2$ region to the region $4 \GeV^2 \leq W^2 \leq 12.5 \GeV^2$ applyingtarget mass corrections. We compare the results for the NLO, NNLO and N$^3$LOanalyzes and include also the large $x$ at N$^4$LO to the Wilson coefficients.A gradual lowering of the higher twist contributions going from NLO to N$^4$LOis observed, which stresses the importance of higher order corrections.

Higher Twist Contributions to the Structure Functions F_2^p(x,Q^2) and F_2^d(x,Q^2) at Large x and Higher Orders