\begin{tabular}[pos]{cols}
  column 1 entry & column 2 entry ... & column n entry \\
  .
  .
  .
  \end{tabular}

                 or

  \begin{tabular*}{width}[pos]{cols}
  column 1 entry & column 2 entry ... & column n entry \\
  .
  .
  .
  \end{tabular*}

  These environments produce a box consisting of a sequence of rows of
  items,aligned vertically in columns.  The mandatory and optional
  arguments consist of:

   o  width:  Specifies the width of the tabular* environment.  There
      must be rubber space between columns that can stretch to fill out
      the specified width.

   o  pos:  Specified the vertical postionion; default is alignment on
      the center of the environment.

       -  t - align on top row

       -  b - align on bottom row

   o  cols:  Specifies the column formatting.  It consists of a
      sequence of the following specifiers, corresponding to the
      sequence of columns and intercolumn material.

       -  l - A column of left-aligned items.

       -  r - A column of right-aligned items.

       -  c - A column of centered items.

       -  | - A vertical line the full height and depth of the
          environment.

       -  @{text} - This inserts text in every row.  An @-expression
          suppresses the intercolumn space normally inserted between
          columns; any desired space between the inserted text and the
          adjacent items must be included in text.  An \extracolsep{wd}
          command in an @-expression causes an extra space of width wd
          to appear to the left of all subsequent columns, until
          countermanded by another \extracolsep command.  Unlike
          ordinary intercolumn space, this extra space is not
          suppressed by an @-expression.  An \extracolsep command can
          be used only in an @-expression in the cols argument.

       -  p{wd} - Produces a column with each item typeset in a parbox
          of width wd, as if it were the argument of a \parbox[t]{wd}
          command.  However, a \\ may not appear in the item, except in
          the following situations:  (i) inside an environment like
          minipage, array, or tabular, (ii) inside an explicit \parbox,
          or (iii) in the scope of a \centering, \raggedrigth, or
          \raggedleft declaration.  The latter declarations must appear
          inside braces or an environment when used in a p-column
          element.

       -  *{num}{cols} - Equivalent to num copies of cols, where num is
          any positive integer and cols is any list of
          column-specifiers, which may contain another *-expression.