my $chart = Chart::Gnuplot->new(
        output => "/home/hmadhi/workspace/CommsNet/www/Plots/$kpi.png",
        title  => {text=>"$kpi Success Rate on $node/$ran ($interface) $date",
                  },
        xlabel => {text=>"Time",},
        ylabel => "$kpi Succ_Rate",
        timeaxis => "x",
        xtics    => {
                       labelfmt => '%H:%M',
                    },

    );