The phrases are beneath the diagram because they explain (in greater detail) its contents. This is common practice when explaining graphs, tables, charts and diagrams and the word " Source " is used to indicate where the information in the diagram came from. Markup = increase in price Energy Technology Perspectives 2010 (the "p" was mistakenly not capitalized) is the name of an annual report published by the International Energy Agency.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.