how to show decimal on contour line

In script, I use

  res@cnFillOn = False
  res@cnLinesOn = True
  res@cnLevels =(/1000.0,1002.5,1005.0,1007.5,1010.0,1012.5/)
  res@cnLineLabelInterval = 1
but the output picture show value 1000 1003 1005 1008 on contour lines. it seems the decimal are rounded off.
How can I draw original decimal value on contour line?
Thanks in advance!

JinQ

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