'area'},
{
color: '#f15b4f',
name: 'KO',
data: responses[2],
tooltip: { yDecimals: 0, ySuffix: '', valueDecimals: 0 }
,type: 'area'},
    allUsersData,
{
  
type: 'pie',
name: 'Distribution',
data: [
  {name: 'OK', y: 28164.0, color: '#68b65c'},{name: 'KO', y: 26476.0, color: '#f15b4f'}
],
center: [775, -40],
size: 70,
showInLegend: false,
dataLabels: { enabled: false },
dataGrouping: { enabled: false }

}

  ]
});

requestsChart.setTitle({
  text: '<span class="chart_title">Number of responses per second</