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@@ -312,8 +312,10 @@ start with the @samp{#} character are treated as comments.
@section Invoking slope.py
@command{slope.py} is an interactive program that is able to derive
-local gradient information from elevation data and user input. To start
-the program the command is:
+local gradient information from elevation data and user input. The
+program reads the elevation data from the file @file{topography.txt},
+which must be located in the working directory. To start the program
+the command is:
@example
./slope.py