In the document "developer-7.3.2-US.pdf" which i have downloaded from http://www.postgresql.org/docs/manuals/archive/ , at many places references are made about the figures. For example in section 2.5.2 it is given as: "Figure \ref{plan} shows the plan produced for the query in example \ref{simple_select}". I would be grateful if you let me know where I can find these figures.