diff --git a/maintenance.py b/maintenance.py
index ff42209..8a27157 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([-0.30,-0.25,-0.20,-0.15,-0.10,-0.05,0.0,0.05,0.10,0.15,0.20,0.25,0.30])
+        ax1.set_yticks([-0.25,0.0,0.25])
 
         ax1.set_title('Error[D]')
         # adding horizontal grid lines