mapserver clue

I'm using mapserver to display some atmospherichal data. I got a shapefile 
with lat lon and 39 attributes. Each attribute is a concentration of gas in 
the atmosphere for 39 altitudes. The map displays the measurement points (lat 
long) and when you query that point you get an html with a two column table 
(high - concentration). Besides the table it would be nice to have a graph 
high-concentration. I know some php programs that can plot data from a data 
files like csv o txt (http://ftp.gnus.org/circus/chart/chart-manual.php). The 
problem is that i don't know how to generate a data file from mapserver.

 Any sugestion?

I am generating the shapefiles so i may generate other "auxiliary" files...

 Thanks

  Tomas