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 4. [Viewing vertical wind flow](4-4-vertical-vector-field)
 5. [Viewing 3D iso-level surface for jet stream](4-5-isosurface)
 6. [Viewing temporal changes of wind flow](4-6-time-series-data)
-7. [Saving as images & videos](4-6-saving-images)
-8. [Side-by-side comparison using two windows](4-7-multiple-windows)
-9. [How to speed up repeated tasks](4-8-speed-up-repetitions)
+7. [Saving as images & videos](4-7-saving-images)
+8. [Side-by-side comparison using two windows](4-8-multiple-windows)
+9. [How to speed up repeated tasks](4-9-speed-up-repetitions)
  
 5 Appendices
 * [Acknowledgement](5-1-acknowledgement)