mlAct back

        t = data_y(iBlk).GetTime();

        fq = 1/(t(2)-t(1));

        ml = data_y(iBlk).GetMeasListSrcDetPairs();

        if isempty(mlActAuto{iBlk})

            mlActAuto{iBlk} = ones(size(ml,1),1);

        end

        mlAct = mlActAuto{iBlk};

    end

    %% find the list of short and long distance channels

    lst = 1:size(ml,1);