...OC1
OC1 is available at http://www.cs.jhu.edu/salzberg/announce-oc1.html and ftp://ftp.cs.jhu.edu/pub/oc1.
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...density
Density measures the darkness of the photographic plate and is a non-linear function of the intensity of light to which the plate was exposed.
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Richard L. White, rlw@stsci.edu
1996 Aug 16