WELCOME TO THE CONTOUR DEMO

   This application shows IDL's contouring capabilities
   as applied to a global map of elevations.


   MENU OPTIONS
   ------------

   File Menu:
       Select Quit to exit the Contour demo and return to
       the IDL Demo main screen.

   About Menu:
       Select "About contours" for information about the 
       Contour plot demo.  


   CONTOUR FEATURES
   ----------------

   <<Basic>> checkbox
       Displays the contour lines  with solid white lines.

   <<Colored lines>> checkbox
       Displays the contour lines with solid lines in 
       different colors.

   <<Fill>> checkbox
       Fills the areas between the contour lines with 
       different colors.

   <<Linestyle>> checkbox
       Displays the contour lines with various linestyles.

   <<Annotation>> checkbox
       Annotates contour lines with their respective 
       values. The "Number of levels" slider is disabled.

   <<Fill and lines>> checkbox
       Displays a filled contour plot with the contour lines
       shown as solid white lines.

   <<Number of levels>> slider
       Select the number of contour levels. You can choose 
       7, 11, or 15 levels.