To rule across the full width of a table:

nltRule 2

In this release, rules are always solid and black. Possible future enhancements would be colour and line-style. Also it may be a requirement to specify which column boundaries to rule between on the table.

Note that this does not break the continuity of the table, so you can separate two blocks of data with:

nltList mat[1;;]
nltRule 2
nltList mat[2;;]

This may often be easier to program than to set a vector of horizontal gridlines, and then pass the entire table in a single call.

A vector of values gives: (line-gap-line-gap .... ) so that:

nltRule 1 3 2

is ‘thin-gap-thick’. The odd-numbered elements are equivalent to calling nltBump.