For a vector field D = ρ cos2 ϕ aρ + z2 sin2 ϕ aϕ in a cylindrical coordinate system (ρ, ϕ, z) with unit vectors aρ, aϕ and az, the net flux of D leaving the closed surface of the cylinder (ρ = 3, 0 ≤ z ≤ 2) (rounded off to two decimal places) is ______.
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