I have the following jqPlot code that is not doing what I´m expecting. I need to plot a simple step chart with the given points:

```
var line1 = [['2014-01-15 15:10:01', 21],
             ['2014-01-15 15:10:12', 21],
             ['2014-01-15 15:10:12', 22],
             ['2014-01-15 15:10:14', 22],
             ['2014-01-15 15:10:14', 21],
             ['2014-01-15 15:10:17', 21],
             ['2014-01-15 15:10:17', 22],
             ['2014-01-15 15:10:23', 22],
             ['2014-01-15 15:10:23', 18],
             ['2014-01-15 15:10:28', 18]];

        var plot1 = $.jqplot('chart1', [line1], {
            title: 'Default Date Axis',
            axes: { xaxis: { renderer: $.jqplot.DateAxisRenderer } },
            series: [{ lineWidth: 1, markerOptions: { style: 'square' } }]
        });

```

The plot does not show the step chart. It shows all points together in the right corner of the graph.

Please check out the following fiddle: [JsFiddle](http://jsfiddle.net/cox123456a/559f4/)

Thanks in advance for any kind of help.