diff --git a/lifsuscept.py b/lifsuscept.py
index dbf079f..43c853f 100644
--- a/lifsuscept.py
+++ b/lifsuscept.py
@@ -121,7 +121,9 @@ def plot_chi2(ax, s, r0, freqs, chi2):
     vmax = 300
     pc = ax.pcolormesh(freqs, freqs, chi2, vmin=0, vmax=vmax,
                        rasterized=True)
-    ax.plot([0, 0, 1], [1, 0, 0], **s.lsDiag)
+    #ax.plot([0, 0, 1], [1, 0, 0], **s.lsDiag)
+    ax.axhline(0, **s.lsDiag)
+    ax.axvline(0, **s.lsDiag)
     ax.set_aspect('equal')
     ax.set_xlabel('$f_1$')
     ax.set_ylabel('$f_2$', labelpad=6)