function ht=autoc2(ts,mn,mx)%,autoc_bins,autoc_step)
    if ~exist('mn','var')
        mn=0;
        mx=1;
    end

    overl=5000;
    ksel=1:min(numel(ts),overl); %memory overload
    ht=[];
    if numel(ts)>1

        while ~isempty(ksel)
            haux=bsxfun(@minus,ts(ksel),ts(ksel)');
            ht=[ht; haux(haux>mn & haux<mx)];
            ksel=ksel(end)+1:min(numel(ts),ksel(end)+overl);
        end
    end

end