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0.4<br />

0.3<br />

0.2<br />

0.1<br />

PL<br />

SO<br />

IM<br />

AG<br />

SF<br />

IN<br />

Stellar<br />

Cosmology<br />

Galaxies + Clusters<br />

Papers per Year<br />

0.0<br />

1500<br />

1000<br />

500<br />

Stellar<br />

Cosmology<br />

Galaxies + Clusters<br />

0<br />

1980 1985 1990 1995 2000 2005 2010<br />

Date<br />

Figure 4‐10: Statistics <strong>of</strong> papers published in journals on the FFAR list, by field. <strong>The</strong> top panel<br />

presents fields as a fraction <strong>of</strong> all papers published, and the bottom panel gives the absolute<br />

number <strong>of</strong> papers per year. Fields were assigned by Bayesian classification <strong>of</strong> title, abstract,<br />

and keyword text extracted from the ADS. <strong>The</strong> field abbreviations are: PL, planets and solar<br />

system; SO, solar; IM, ISM and the Galaxy; AG, active galactic nuclei; SF, star and planet<br />

formation; and IN, instrumentation. <strong>The</strong> reported fractions are annual averages.<br />

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

4-15

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