%%
% Plots of various measures of translation velocities of synthetic and
% historical tracks. A message box is first displayed listing key
% domain-wide statistics of the comparison between synthetic track and best
% track translation velocities: Bias of the zonal and meridional components
% (mean of the synthetic minus the historical track velocity components)
% and root-mean-square (RMS) of the magnitude of the vector difference
% between the synthetic and historical translation vectors. 
%
% Then a menu appears with various plot options. The first displays the
% vectors of the mean translation velocity, averaged over lat-long boxes
% with resolution specified by the parameter mres in the _params.m_ file. The
% second is the same but for historical storms over the period _bestyears_
% in the _params.m_ file. The third displays both, and the fourth displays
% the average vector of the synthetic minus the historical tracks.
%
% The historical translation velocities are only calculated over grid boxes
% in which the number of historical tracks exceeds the parameter
% _mintracks_ in the _params.m_ file. This is also true of the difference
% vectors.
%
% The scale of the arrows is indicated in a text box on each figure, except
% the figure showing both historical and synthetic translation vectors. The
% scale is simply the maximum magnitude of the translation vector (or
% vector difference) in the domain.
%
% The statistics can be calculated over a sub-domain specified in the
% _params.m_ file; likewise, the statistics can be calculated only for storms
% whose maximum surface winds in each lat-long box exceed a threshold as
% specified in _params.m_ .
%
% Various map properties can also be set in _params.m_.
