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",
    );
    
    # Create dataset object and specify the properties of the dataset
    my $dataSet1 = Chart::Gnuplot::DataSet->new(
        xdata => \@time,
        ydata => \@succ_rate,     
        timefmt => '%H:%M',
    );