Index Value Plot

http://www.cxoadvisory.com/reversion-to-value-rtv-model-details/

An index value plot depicts an index value on a line graph.  Index value plots are used for things such as stocks, inflation, and other financial aspects. This graph in particular shows comparisons between S&P 500 Index and S&P 500 forward earnings and how they yield over the sample period. This is then related to the forward earnings and how they yield to stock market returns over fixed future intervals.