PROCEDURE: reduce_var_dimensions,data,limits INPUT: data: a structure with elements: x (typically time) y (3 dimensional data array) v1 v2 limits: a structure with elements: v1_range: bin range for dimension 1 (two element array) v2_range: bin range for dimension 2 (two element array) avg_var: 1 or 2. variable to sum over Caution: This procedure is still in development. Created by: Davin Larson, Sept 1995 File: %M% Version: %I% Last Modified: %E%