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Appendix A: Radial SLE
======================

Here we give details about a polymer starting at 0, and ending at $z_0$, and the force it exerts on the slit with height $h$ above $a$. We use the formula above Eq. (\[19\]) that removes the slit, $g_A(z) = \sqrt{(z-a)^2+h^2} + {{{\mathrm{sign}}}}(a) \sqrt{a^2+h^2}$. Note that the cut of the square root must be such that $g(z) \sim z$ at infinity, hence $g(x)<0$ for $x<a$, and $g(x)>0$ for $x>a$. 