Hi Michelle, Try: write_table("test.csv", "a", data, "%g%g%g%g%g%g") ;fill in data Since you want to write 6 columns so it should have 6 (%g). HTH... Rashed -------------- next part -------------- An HTML attachment was scrubbed... URL: http://mailman.ucar.edu/pipermail/ncl-talk/attachments/20160408/3cdad939/attachment.html