How to make data spacing uniform?

Question

Highcharts

I use Highstock for charting

navigation = new Highcharts.StockChart({
                        chart: {
                            renderTo: 'chartdiv'
                        },
                        navigator: {                      
                            xAxis: {
                                labels: {
                                    y: 10                                   
                                },
                                type: 'datatime',
                                dateTimeLabelFormats: {
                                    day: '%d/%b',
                                    week: '%d/%b',
                                    month: '%d/%b',
                                    year: '%d/%b'
                                },
                                minTickInterval: 0,
                                minorTickInterval: 3600 * 24                               
                            }
                        },
.........

So when all the data for a certain time interval is there, everything is fine. The gradation is uniform. But if I take a time interval where there is no piece of data, then the graph compresses them. If the option is to leave the gradation uniform even where there is no data.
Example