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Equation Icon  4Gω-- f (r,x, t) = l g(r)𝜃(x − t)𝜃(t − x − l) (33 ) { 2 2 g (r) = r ∕ρ 2 2 for r < ρ. (34 ) 1 + ln(r ∕ρ ) for r > ρ