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Table Markup Requiring Modification
If your document contains either of the two table elements described in the following table, you need to modify the document.
These Tags:
Must be modified in this way before entering set tabletags=off at the command line to change to table image mode.
Technical Notes
<colspec>
Have one <colspec> tag for each column. Have all colwidth attributes either fixed (for example, "2in") or relative (for example, "3*").
Inside <tgroup>, a missing colnum or colname attribute does not imply that all columns take on the specified attributes.