--- /dev/null
+import wtk_graph;
+
+usepackage("amsmath");
+
+size(8cm,6cm,IgnoreAspect);
+
+scale(Log, Linear, Log);
+real xscale=1;
+real yscale=1e9;
+
+graphMatrixFile("fit-valley-PBS.dat", xscale=xscale, yscale=yscale,
+ x_label="$k_{uo}$ (s$^{-1}$)", y_label="$\Delta x_u$ (nm)",
+ palette_label="$D_\text{JS}$");
+
+label(sLabel("PBS"), point(N),N);