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    %% Combine Options Structures
% Create two options structures. 
opts_1 = odeset('RelTol',1e-8,'AbsTol',1e-9,'OutputFcn',@odeplot,'Stats','on');

%%
opts_2 = odeset('Mass',@(t) [t 0; 0 -t],'MStateDependence','none',...
    'MassSingular','no','OutputFcn',@odephas2);

%%
% Combine the options structures, giving preference to |opts_2|. Since both
% structures contain different values for |OutputFcn|, the value in
% |opts_2| overrides the one in |opts_1|.
opts = odeset(opts_1,opts_2)