Figure 2 is a circle and arrow diagram depicting a central module, named 
"Vacuum Control", with four arcs oof of the bottom pointing to the submodules 
"Vacuum History", "EMs", "Control & Status" and "Pump Surv." from left to 
right. On the left hand side of the main "Vacuum Control" module, there are 
a further two squggly arcs pointing to documentation nodes, labelled "ENQUIRE" 
and "Spec." from top to bottom.