SortFigs:

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   Sort figure windows by cascading them.
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   Form:
   SortFigs( h, xo )
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   ------
   Inputs
   ------
   h            (1,:)   Array of figure handles. Optional. If not
                        provided, all current figure handles will be used.
   xo            (1)    Horizontal offset for first figure. Optional,
                        default is 0.

   -------
   Outputs
   -------
   h            (1,:)   Array of figure handles.

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