“…Let P ℓ be the cusp associated to an isotropic line ℓ ∈ Iso(V ). We have, near the cusp P ℓ , by [DY,Theorem 5.1] and (4.3) (4.14) Ξ ∆,r (n, µ, v)(z) = −g ∆,r (n, µ, v, P ℓ ) log | q ℓ | 2 −2ψ ∆ (n, µ, v; q ℓ ), where ψ ∆ (n, µ, v; q ℓ ) is a smooth function of q ℓ (as two real variables q ℓ andq ℓ ) and…”