Hello

IWith the following script, I would expect the hAxis starting at "0" but it 
starts at "1" ( see the picture attached)..

Any idea what's wrong ?

Thanks in advance


<script type="text/javascript" 
src="https://www.gstatic.com/charts/loader.js";></script>
    <script type="text/javascript">
      google.charts.load('current', {'packages':['line']});
      google.charts.setOnLoadCallback(drawChart);

    function drawChart() {

      var data = new google.visualization.DataTable();
      data.addColumn('timeofday', 'Heure');
      data.addColumn('number', 'Hier');
      data.addColumn('number', 'Aujourd hui');
      data.addColumn('number', 'Avant hier');

      data.addRows([
[[0, 0, 0],-13.8,  1.8,-11.8],
[[0 ,15, 0],  0.9,  1.8,  2.4],
[[0,30, 0],  5.4,  1.8,  5.7],
[[0, 45, 0],  1.7,  1.8, 10.5],
[[1, 0, 0], 11.9,  1.8, 10.4],
[[1, 15, 0],  8.8, 13.6,  7.7],
[[1, 30, 0],  7.6, 12.3,  9.6],
[[1, 45, 0], 12.3,  9.2, 10.6],
[[2, 0, 0], 16.9,  2.9, 14.8]
      ]);

      var options = {
        chart: {
          title: 'Temperature Chevry Ext',
          subtitle: 'mesure chaque quart d heure'
        },
        
        width: 900,
        height: 500,
        hAxis: {
          title: 'heures' , format: 'H m'                  
        }
      };

      var chart = new 
google.charts.Line(document.getElementById('line_top_x'));

      chart.draw(data, google.charts.Line.convertOptions(options));
    }
  </script>

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