The
galaxy
data frame records the radial velocity of a spiral galaxy
measured at 323 points in the area of sky which it covers. All the
measurements lie within seven slots crossing at the origin.
The positions of the measurements given by four variables (columns).
Buta, R. (1987) The Structure and Dynamics of Ringed Galaxies, III:
Surface Photometry and Kinematics of the Ringed Nonbarred Spiral
NGC7531. The Astrophysical J. Supplement Ser.
Vol. 64, pp. 1--37.
John M. Chambers and Trevor J. Hastie, (eds.) Statistical Models in S,
Wadsworth and Brooks, Pacific Grove, CA 1992, pg. 352.
plot(galaxy$east.west, galaxy$north.south)