changing labels on a chart (will be numeric to string)

I have a query that produces a lovely table base search |chart values(Number) as State over Date by description Date | act1 | act2 | act3 M05 | 1 _ .... | -1_ .... | 3.... M06 | 5 _ .... | -1_ .... | 3.... M07 | 5 _ .... | -1_ .... | 4.... M08 | 5 _ .... | -1_ .... | 4.... Each of the numbers under the actions relate to a state of play (not started, in progress etc). I can create all sorts of graphs off this data but I have been asked to change the number scale to description of the action I can change Numbers to Description to get the following data but I can only create tables from it (stats and chart needing numeric values) Date | act1 | act2 | act3 M05 | NS_ | NA_ | IP_ M06 | Co_ | NA_ | IP_ M07 | Co_ | NA_ | IP_ M08 | Co_ | NA_ | Re_ Is there a way to change number value to a string on the axis once the chart has been completed. Happy to go with css if can't be done in xml. Many thanks