Process Action: Pentaho Data Integration - Result Set Columns

Hi,

I have a ktr file which is called by an xaction using the Get data from pentaho data integration step, this ktr file reads an excel spreadsheet which contains 3 columns of data.

I want to be able to loop over the rows in the result set, can anybody advise how I can reference the individual columns in the result set while in the loop.

Thanks
Adrian