ble.</dd>
<dt>"missing_value"</dt>
<dd>the value used as a flag for missing-data. This will be (or will be treated as) a value consistent with the type (including bit size) of the data given by the <i>"data"</i> key.</dd>
<dt>"data_unit"</dt>
<dd>a string describing the unit of the data</dd>
<dt>"axis_types"</dt>
<dd>a list of integer values describing the type of each axis. Possible values are the following constants defined by the pyferret module:
<dl><dt>AXISTYPE_LONGITUDE</dt>
<dd>a longitude axis, typi