y valid_range (if used) for a variable. It is not necessary to define your own _FillValue attribute for a variable if the default fill value for the type of the variable is adequate.</li>
<li><strong>missing_value</strong> - missing_value is a conventional name for a missing value that will not be treated in any special way by the library, as the _FillValue attribute is. It is also useful when it is necessary to distinguish between two kinds of missing values. <a name="rev2_issue3" id="rev2_issue3"></a>The 