The array environment is used to make a table of information, with column alignment (left, center, or right) and optional vertical lines separating the columns. \begin{array}{col1col2…coln} item11 & item12 … & item1n\\ item21 & item22 … & item2n\\ ... Each of col1, col2, etc. is a single letter, c - for centred l - for flush left r - for flush right The column format letters can be interspersed with vertical bars (|), which result in rendering vertical bars as needed in the formatted matrix. If a horizontal line is needed in the matrix, \hline can be used.