typo

Author: oscarbranson

book/03_cryosphere/l11.md

@@ -164,7 +164,7 @@ h_-^4 & = & \frac{12\eta}{\rho g}\alpha\left(d + \frac{x^2}{2} - x_N x\right) \q
 \end{eqnarray}
 ```
 
-Noting that $h(x_N) = 0$ gives $d = 0$, and hence matching $h_+ = h_- = h_\star$ gives $x^* = \frac{x_N}{2}$. The complete profile of the ice sheet is therefore given by
+Noting that $h(x_N) = 0$ gives $d = x_N^2/2$, and hence matching $h_+ = h_- = h_\star$ gives $x^* = \frac{x_N}{2}$. The complete profile of the ice sheet is therefore given by
 
 ```{math}
 h = \left\{\begin{array}{ll}