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+ptiger is a Tcl/Tk/Tkgeomap script that uses wdgeomap to display U.S.
+Census Burea populated places on an interactive geographic map.
+
+To run it, type ptiger on the command line. After a few seconds, a map
+should appear. Adjust the view by Dragging or Double-Clicking. As the
+cursor moves, a label below the map displays the cursor location and
+the azimuth and range from the + marker to the cursor. Move the + marker
+by Right-Double-Clicking. The map has dots at places with population
+greater than a user selected threshold. Moving the cursor over a dot
+labels the place with its name and displays the population in another
+label below the map. In addition to the wdgeomap menus, a Places menu
+enables adjustment of the population threshold and dot size. There is
+also a Find menu that does a case insensitive regular expression search
+for a named place.
+
+WWW: http://www.tkgeomap.org/ptiger.html
+Author: Gordon Carrie <tkgeomap@users.sourceforge.net>