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| 16.1 | Backward Compatibility Backward compatibility was the first requirement of the netCDF-4 project. | 
| 16.2 | How to Upgrade netCDF-3 code to netCDF-4 Adapting netCDF-3 reading code to netCDF-4 is straightforward | 
| 16.3 | How to Upgrade netCDF-3 code to netCDF-4 Adapting netCDF-3 code that writes data to netCDF-4 is also easy | 
| 16.4 | Define versus Data Mode NetCDF-4 doesn't require distinguishing between calls that are restricted to "define mode" or "data mode". | 
| 16.5 | Incremental Transition to netCDF-4 Using the netCDF-4 classic model API provides an easy transition to using netCDF-4 features. | 
| 16.6 | Recommendations for using netCDF-4 Don't upgrade unless or until you need to upgrade. |