change x axis values of a bar chart

Hi,

I want to display a histogram chart in Openoffice calc  via a java code. I
have been able to get the chart, but I want to change the x axis values of
the chart (which is now 1,2,3 etc.) to values taken from a cellRange of  the
same calc spreadsheet document.

I am quite unsure about the procedure i should follow to do this. It would
be really helpful if someone can help me one this.

Thank you
-- 

Best regards,
Pivithuru Wijegunawardana
University of Moratuwa
Sri Lanka