For total centre-of-mass energies of a few GeV, the cross-section for the reaction + e

For total centre-of-mass energies of a few GeV, the cross-section for the reaction ν_μ + e⁻ → μ⁻ + ν_μ is given by σ = G²_F E²/π in natural units, where G_F is the Fermi coupling constant (1.42). What is the cross-section in picobarns at an energy E = 3GeV?

Equation 1.42

G_F = 1.166 × 10⁻⁵ GeV⁻².