  The deep inelastic scattering mode of $t\overline{t}$ pair production at the
proposed LHeC and FCC-eh is considered. We present a method to extract the top
reduced cross section related to the transversal structure function
$F_{2}(x,Q^{2})$ parameterization. Numerical calculations with known kinematics
of the LHeC and FCC-eh colliders are demonstrated. The results obtained for
charm and beauty pair production are comparable with the experimental data. We
show that for a wide range of the momentum transfer into the top quark pair,
the reduced cross section is well described by center-of-mass energies.
