How to deal with the missing data

Hi,

I want to display some 2D/3D data, but I'm not sure whether visad can deal with 
the missing data, or how to do it?

thanks
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  WANG Lizhi

  Key Laboratory of Regional Climate-Environment for East Asia,
  START/RRC Temperate East Asia, Institute of
  Atmospheric Physics, Chinese Academy of Sciences

  Tel(O)  :  86-10-62063389
  Fax(O)  :  86-10-62045230
  E-mail  :  wlz@xxxxxxxxx
  Address :  P.O.Box 9804,Beijing 100029,  P.R.China
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