or modes in each case (by exhaustive enumeration)
%          and form a (weighted) histogram of all such posterior modes.
%          Since {x_i} are deemed exchangeable the elements of x can be pooled
%          to give a single marginal prior p(x_i) that is the same for all i.
%          This expected marginal posterior is here plotted & visualized as
%          the empirical proxy for the "right" sparsity prior for the model.
%
% REPLACE_WITH_DASH_DASHREPLACE_WITH_DASH_DASHREPLACE_WITH_DASH_DASHREP