colwidth

is the column width setting. Column width can be specified as a proportional measure, a fixed measure, or a mixed measure.
- A proportional measure is of the form "number*" (eg, "10*"), and means that the column width is the number times the proportion.
- A fixed measure is of the form number and unit (eg, "25pt", "25mm", "16.2in"). The units are case insensitive and can be "pt" (points), "cm" (centimeters), "mm" (millimeters), "pi" (picas), and "in" (inches). The default fixed unit must be "pt" if neither a proportion nor a fixed unit is specified. An example of a mixed measure is "10*"+"3pt".
- If no column width is specified for a column specification, this implies that the column has the proportional width "1*", and hence, if no column widths are specified for any column, the column widths will be the same for each column and will be an equal proportion of the available width.