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The context menu options depend on where the right-click occurred:
Graph Plot
Y-axis
X-axis
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When you zoom or pan, a bold circle is displayed, representing the deadzone. If the mouse pointer is within the deadzone, no zoom or pan change occurs. A faint circle is drawn when the mouse pointer is outside the deadzone, highlighting the current pointer position.
  Zoom indicator |   Pan indicator |
When multiple x-axes are present, zooming or panning one affects all the x-axes (they are linked).
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