For the PDL version of the NetCDF interface:

Copyright (c) 1997 Douglas Hunt. All rights reserved. This program is free software;
you can redistribute it and/or modify it under the same terms as Perl itself. 

For the old NetCDF interface:

Copyright 1995 University Corporation for Atmospheric Research/Unidata

Portions of this software were developed by the Unidata Program at the 
University Corporation for Atmospheric Research.

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