In spherical coordinates, let â_θ, â_φ denote unit vectors along the θ, φ directions. E = (100/r) sin θ cos(ωt - βr) â_θ V/m and H = (0.265/r) sin θ cos(ωt - βr) â_φ A/m represent the electric and magnetic field components of the EM wave at large distances r from a dipole antenna, in free space. The average power (W) crossing the hemispherical shell located at r = 1km, 0 ≤ θ ≤ π/2 is ________