def format_header(header_values):
    """
    Formats a row of data with bolded values.

    :param header_values: a list of values to be used as headers
    :return: a string corresponding to a row in enjin table format
    """
    header = '[tr][td][b]{0}[/b][/td][/tr]'
    header_sep = '[/b][/td][td][b]'
    return header.format(header_sep.join(header_values))