Parametrization of F₂^γ at low Q² and of σ_γγ and σ_γ*γ at high energies

A parametrization of the real photon structure function F₂^γ in the low Q², low x region is formulated. It includes both the vector meson dominance (VMD) and the QCD components, the latter suitably extrapolated to the low Q² region and based on arbitrary parton distributions in the photon. The parametrization used together with the Gluck, Reya, and Vogt (GRV) and Gluck, Reya, and Schienbein (GRS) parton densities describes reasonably well the existing high energy data on F₂^γ, σ_γγ, and the low Q² data on σ_γ*γ. Predictions for σ_γγand for σ_γ*γ for energies which may become accessible in future linear colliders are also given.