UNITS

(Data type: _CHAR, size = CAT__SZUNI) The units in which values stored in the column are expressed. The UNITS attribute is used to identify, and control the appearance of, columns of angles (see Section ). Apart from this exception the units are treated purely as comments and no attempts are made to automatically propagate and convert units in calculations and selections. Case sensitivity is irrelevant for units since they are treated purely as comments. The units attribute can be left completely blank; a blank units attribute implies that the units are unknown. If it were desired to distinguish a dimensionless quantity from one with unknown units, the string `DIMENSIONLESS' could be put in the units attribute¹³.