Improved iota slider

src/pulsatingscience.ui

@@ -297,10 +297,13 @@
        <item row="4" column="1">
         <widget class="QSlider" name="sliderPulsarSpinAxisInclination">
          <property name="statusTip">
-          <string>Use this slider to adjust the inclination of the spin axis with respect to the orbit axis</string>
+          <string>Use this slider to adjust the ssource plan normal (iota)</string>
+         </property>
+         <property name="minimum">
+          <number>-180</number>
          </property>
          <property name="maximum">
-          <number>360</number>
+          <number>180</number>
          </property>
          <property name="value">
           <number>0</number>