This format requires a combination of Braille Formats rules and Nemeth rules. Use normal table format with column headings and separation lines. Limit the skeleton to 2 blank rows. Braille Formats requires a 2-cell dash to indicate the empty spaces. Nemeth requires a general omission indicator. So under your column headings insert a full cell in 2 rows (1 for each column). Include the tn: This table does not have a specified number of rows.