  The CKMT model describing the nucleon structure function $F_2(x,Q^2)$ in the
framework of conventional Regge theory with smooth soft-hard pomeron is
modified. Smooth soft-hard non-vacuum reggeon dependence on incoming photon
virtuality $Q^2$ is introduced. This dependence has the same functional form as
the smooth soft-hard functional $Q^2$ dependence for pomeron in original CKMT
model. In regeon of low $W^2$ better agreement with experimental data is
observed.
