Map Properties for Lines - Line Width Tab

You can easily change the width of the lines shown on the map. If you want to specify something other than a single width, you need to choose a dataset for determining the width distribution, and then an appropriate mode. Note that you can choose a different dataset than you did for the polygon fill if you wish to show characteristics of two different datasets (in the same geography) in one map.  To override the default values that appear when you classify your data, you can left click in the width box for any category to type in a new value.

If you choose line widths that vary in time, you can check the interpolate values box (lower left corner) to smooth the transitions between widths in an animation or map movie.  Also, you can chose specific line widths for lines with missing values in the lower right corner.

Choose "Preview" to view your selections in the map (don't close the properties dialog box while you preview, or your changes will be lost).  When you have finished choosing a fill scheme, choose "OK" to apply your changes and close the dialog. If you press "Cancel" after "Preview" your changes will not be saved.

Click on tabs and boxes in the image below for more information.