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for vox = 1:length(non_zeros)       %Uso el vector de non_zeros

        %tic

        Y = all_frames_vols(:,non_zeros(vox))./pr';           Y(isnan(Y)|isinf(Y)) = 0;

        %X es siempre la misma

        for i = 1:num_files-2     

             x1 = X(i:end);

             y1 = Y(i:end);

             p = polyfit(x1,y1,1);

             z = polyval(p,x1);          

             err_act = max(abs(z-y1));

             if err_act < Max_err

                 Max_err = err_act;

                 new_p = p;

                 %new_z = z;

                 %time_ind_st = i;

             end

         end

        K_img(non_zeros(vox)) = new_p(1)*60; %Es lo que quiero

%         toc

%

%         pause

    end