Gnumeric Spreadsheet graph problem

[Immi]

Hi, I need help to figure out a Gnumeric Spreadsheet graph problem.
I have a xy graph which shows numbers from 0 to 5. In the input line there are a few free cells and I don't want them to be shown in the graph. They appear as 0s. So, how can I avoid that? Thank you.
Immi

[Immi]

Ok, I found a way to work around it.
Immi

[Nile]

Can we see your solution?

[Immi]

The solution is too simple. Well, I set the free cells to "10" (basicly a number out of the graphic) and they wouldn't be shown. That's it.
Immi