BarChart column thickness



i have a chart with a linechart and a barChart. The user can enter date based data, for any date, values can be entered. One part of the data is displayed in the line chart, and another value should be displayed as a bar from zero to value.

I setup everything and if i enter one value for a date, the value gets displayed correctly with a thick bar. if i enter another value with a date near the first date, nothing gets displayed anymore.

So the question would be, is there a possibilty to set the thickness of the bars, so that more bars could fit into the graph. New values could appear every hour, so the bars need to be realy thin. Hopefully you can give advice on that or suggest another Chart Style for such values.