diff --git a/utils/Quality_Relabel.py b/utils/Quality_Relabel.py
index 0b9ee52..331d34b 100644
--- a/utils/Quality_Relabel.py
+++ b/utils/Quality_Relabel.py
@@ -410,6 +410,12 @@ class Quality_Relabel:
                   self.signal_select[channel][SP * self.frequency:EP * self.frequency], label=channel,
                   color=self.color_cycle[0])
 
+        plt_.arrow((EP + SP) // 2 * self.frequency,
+                   self.signal_select[channel][SP * self.frequency:EP * self.frequency].max(),
+                   (EP + SP) // 2 * self.frequency,
+                   self.signal_select[channel][SP * self.frequency:EP * self.frequency].mean(),
+                   )
+
         for j in event_code:
             if channel == "SpO2":
                 mask = self.spo2_event_label[SP * self.frequency:EP * self.frequency] == j