Define number of horizontal lines in chart

If I add a chart control, i.e. a line graph I have two options for the horizontal helper lines



a) Automatic

b) Manual



If I use automatic List&Label decides how many lines to add which is too much in this example.



umsatz.png - directupload.net



for manual mode I need to define an interval myself which mean I have to calculate the maximum value, round it up to the next big figure and devide it by the quantity of lines I want to have.



I would like to define the number of lines for automatic mode (i.e. 4) and let list&label do the math to get the desired result.



umsatz2.png - directupload.net