[idvusers] IDV Jython, Append to Netcdf?

Hi IDV'ers,

I'm using the 'exportGridToNetcdf' method to write a grid to a Netcdf file,

  exportGridToNetcdf(outField, "out.nc")

but I have more than one grid I want to write to the file.  Is there a way
I can use this method or is there another method I can use?  For example,
can I append to a Netcdf file?

Thanks in advance,