This excerpt taken from the PDFS DEF 14A filed Apr 21, 2006.
STOCK PERFORMANCE GRAPH
The following graph compares the cumulative total stockholder return data for our stock since July 26, 2001 (the date on which the Companys stock was first registered under Section 12 of the Securities Exchange Act of 1934, as amended) to the cumulative return over such period of (i) The Nasdaq Stock Market (U.S.) Index and (ii) the RDG Technology Composite Index. The graph assumes that $100 was invested on July 27, 2001. The graph further assumes that such amount was initially invested in the Common Stock of the Company at a per share price of $12.00 (price at which such stock was first offered to the public by the Company on the date of its initial public offering) and reinvestment of any dividends. The stock price performance on the following graph is not necessarily indicative of future stock price performance.