about H labels

hi,
when i use
      res@cnHighLabelsOn = True
there are " H0.2 H2.4 H3.... " on the map.
How can i only present those H labels which are larger than 1.0 (H2.4 H3...), not all of them?

Thanks.
JinQ

--
JinQ,                          M.S. 
Ocean University of China
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Received on Wed Feb 22 02:55:59 2012