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29%<br />

1990<br />

44%<br />

US Priv<br />

US Fed<br />

Other<br />

Europe<br />

20%<br />

7%<br />

2010<br />

46%<br />

39%<br />

US Priv<br />

US Fed<br />

Other<br />

Europe<br />

9%<br />

6%<br />

FIGURE 3‐2 Distribution <strong>of</strong> OIR telescope aperture around the world. Colors denote fraction <strong>of</strong> telescope<br />

primary mirror area held by U.S. private institutions (blue), U.S. federally funded national observatories (red),<br />

European‐run observatories (purple), and other foreign‐led observatories (green). <strong>The</strong> main change since 1990<br />

has been a sharp decline in the share <strong>of</strong> telescope aperture available through U.S. public observatories.<br />

PREPUBLICATION COPY—SUBJECT TO FURTHER EDITORIAL CORRECTION<br />

3-10

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