Table of Contents
The title and subtitle commands can be used to specify titles
for the chart. You must supply a label, perhaps using the colon syntax.
title: This is a title; subtitle: This is a subtitle;
The title and subtitle include text and a box around the text - the latter
being omitted in the ‘plain’ design. You can turn it on by setting
the ‘line.*’ and ‘fill.*’ attributes.
The default attributes are taken from the default styles title and
subtitle, changing these will affect all titles in the chart.
Entity lines are not drawn behind the titles by default, this can be changed
by setting the vline.* attribute.