Footnotes

HEASARC Staff Scientist Position - Applications are now being accepted for a Staff Scientist with significant experience and interest in the technical aspects of astrophysics research, to work in the High Energy Astrophysics Science Archive Research Center (HEASARC) at NASA Goddard Space Flight Center (GSFC) in Greenbelt, MD. Refer to the AAS Job register for full details.

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The FIT subroutine minimizes c2 using a modified version of Bevington's CURFIT subroutine. Bevington's book Data reduction and Error Analysis for the Physical Sciences, published by McGraw-Hill in 1969, is an excellent introduction to statistics. Anyone interested in a detailed understanding of how CURFIT works should consult this book.
...
Uncertainties in parameter values are estimated using the method described in ``Parameter Estimation in X-ray Astronomy'', by M. Lampton, B. Margon, and S. Bowyer, in Astrophysical Journal (1976) 208, 177.
...
The spline is computed by solving equation 3.3.7 in the 1988 edition of Numerical Recipes, by Press, Flannery, Teukolsky, and Vetterling.
...
Details of Akima's method can be found in ``A new method of Interpolations and smooth curve fitting based on local procedures'' by Hiroshi Akima in J. of the Ass. for Computing Machinery, (1970) 17, 589-602. (An implementation is described in PPC Journal, (1985) 12, no. 10, 11-14).

Web Page Maintained by: Dr. Lawrence E. Brown elwin@redshift.gsfc.nasa.gov