dev (#285)

Co-authored-by: Dominik Demuth <dominik.demuth@physik.tu-darmstadt.de>
Reviewed-on: #285

src/resources/_ui/ptstab.ui

@@ -42,7 +42,7 @@ Changing between regions and points is NOT possible</string>
    <item>
     <widget class="QGroupBox" name="groupBox">
      <property name="title">
-      <string>Average</string>
+      <string>Average (drop-down used for pts and regions)</string>
      </property>
      <layout class="QHBoxLayout" name="horizontalLayout">
       <property name="spacing">
@@ -109,6 +109,11 @@ Changing between regions and points is NOT possible</string>
           <string>Integral</string>
          </property>
         </item>
+        <item>
+         <property name="text">
+          <string>Std. deviation</string>
+         </property>
+        </item>
        </widget>
       </item>
      </layout>