Tabularx

• How to Fix “The Control Sequence Was Never Defined” in tabularx
  This LaTeX message means a command is undefined. Find the command in the log, then check spelling, package loading, and tabularx syntax.
• How to Fit a Table into One Column in a Two-Column Document
  Fit a table into one column by sizing it to the column width, wrapping long text with tabularx, and choosing table or table* correctly.