∑(θ′, φ′) [θ, φ] [ℓ+1] [2ℓ + 1] [ℓ] [m=-ℓ] [∞] [ℓ=0]

∑(θ′, φ′) [θ, φ] [ℓ+1] [2ℓ + 1] [ℓ] [m=-ℓ] [∞] [ℓ=0]

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