diff --git a/graphics.py b/graphics.py
index d9a7876872f22530f425505c59f210ef3109ade8..31be3d5cb1c92c3ae171e2619168822a5730e9be 100644
--- a/graphics.py
+++ b/graphics.py
@@ -675,7 +675,7 @@ def plot_overview(exp,label,filename,show_spread=False,show_transformed_paramete
     fig, [[ax0, ax1], [ax2, ax3]] = p.subplots(2,2,constrained_layout=True)
     fig.set_size_inches(6,6)
     #
-    [ax0,ax1,ax2],c0,c1,c2 = plot_CBL_identifiability(exp,exp.obs_error_sdev_assimilate[0],ax=[ax0,ax1,ax2])
+    [ax0,ax1,ax2],c0,c1,c2 = plot_CBL_identifiability(exp,exp.obs_error_sdev_assimilate,ax=[ax0,ax1,ax2])
     ax0.set_title(r'a) Exp. %s, $\rho(p\prime\prime,y_b}$)'%label)
     ax0.set_xlabel('Time (h)')
     ax0.set_ylabel('Height (m)')