%%
% Maps the density of the power dissipation index applied to historical
% tracks. The power dissipation index is the cube of the storm maximum wind
% speed integrated over that portion of the track within each lat-long box
% whose dimensions are specified in _params.m_ . The units are $10^3 m^2/s^2$
% per degree latitude squared.  Other map characteristics can be specified
% in _params.m_ .
%
% The routine _pdimapmt.m_ should be run before this one. 
%
% This version of the script uses MATLAB's mapping toolbox. Various map
% properties can be set in _params.m_ .