Optional items

The optional items are listed in Table  and are described below. Most optional items correspond directly to an attribute of the column (see Section  and Table ). If they are not specified a default is adopted.

Table: Optional items for columns

Item	Description
ORDER	order of the column
UNITS	units
EXFMT	external format for display
PREFDISP	preferential display flag
COMMENTS	descriptive comments
SCALEF	scale factor
ZEROP	zero point
TBLFMT	format in the table