Great Stuff! But how do I clip extra lines below 0!

[jacques lowe]

Hi,

I am finally getting up to speed with said graphs. They are great.

I wanted to know why when the y data value==0, linechart draws below the axis?
My values are always 0 or more.
Is the a way to tell linechart to not darw below the x-axis?

Pics added for context.

Thanks in advance,

Jacques