diff --git a/maintenance.py b/maintenance.py
index 72497a0..9e0330d 100644
--- a/maintenance.py
+++ b/maintenance.py
@@ -391,7 +391,7 @@ class Maintenance(Workflow, ModelSQL, ModelView):
         top = 0.3
         bottom = -0.3
         ax1.set_ylim(bottom, top)
-        ax1.set_yticks([-0.25,0.0,0.25])
+        ax1.set_yticks([-1,-0.75,-0.5,-0.25,0.0,0.25,0.5,0.75,1])
 
         ax1.set_title('Error[D]')
         # adding horizontal grid lines