%%
% Contour plot of the number of historical tracks per unit area in the whole event
% set. Units are number per year per one degree latitude square. Each track
% is counted only once in each lat-long box (whose resolution may be set in
% _params.m_ ), unless the track leaves the box and later re-enters it, in
% which case it is counted twice. (By extension, it is counted _n+1_ times if
% it re-enters the box _n_ times after its first encounter.) Note that all
% tracks that pass the filter used to create the synthetic events, and the
% best track filters specified in _params.m_ , are used. 
%
% This routine uses the free _m_map_ utilities which are included with the
% scripts. Some of the properties of the map can be set in the _params.m_
% file. 