Char array

Hi,
  I tried to replace a char array (species_name in the following netCDF
file) with different gas names. It always give me the error message "
Assignment type mismatch, right hand side can't be coerced to type of left
hand side". I tried different combinations such as stringtochar and
chartostring and did not work.
  Thanks for your help in advance.
  Lei
Here is the information from the netCDF file.
-------------------------------
dimensions:
        lon = 192 ;
        lat = 94 ;
        species = 16 ;
        land_types = 11 ;
        string_len = 20 ;
        time = UNLIMITED ; // (12 currently)
variables:
        float lat(lat) ;
                lat:long_name = "Latitude of cell center" ;
                lat:units = "degrees" ;
        float lon(lon) ;
                lon:long_name = "Longitude of cell center" ;
                lon:units = "degrees" ;
        char species_name(species, string_len) ;
                species_name:long_name = " " ;
                species_name:units = " " ;
        int date(time) ;
                date:long_name = "YYYYMM" ;
                date:units = " " ;
        float fraction_land_type(land_types, lat, lon) ;
                fraction_land_type:long_name = "fraction of each land type"
;
                fraction_land_type:units = "%" ;
        float dvel(time, species, lat, lon) ;
                dvel:long_name = "deposition velocities" ;
                dvel:units = "m/s" ;

 species_name =
  "O3 ",
  "CO ",
  "CH4 ",
  "CH2O ",
  "CH3OOH ",
  "H2O2 ",
  "NO2 ",
  "HNO3 ",
  "PAN ",
  "CH3COCH3 ",
  "CH3COOOH ",
  "CH3CHO ",
  "CH3COCHO ",
  "NO ",
  "HNO4 ",
  "NH3 " ;

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Received on Tue Mar 30 14:54:01 2010