Photons were extracted using the
\anchor{http://www.astro.psu.edu/xray/docs/TARA/ae_users_guide.html}{ACIS Extract}
(AE) software package\footnote{
The ACIS Extract software package and User's Guide are available online at
\url{http://www.astro.psu.edu/xray/docs/TARA/ae\_users\_guide.html}.
}
\citep{Broos02}.
The procedures used in AE are described in \citet{TFM03} and \citet{Getman05b}.
The references used above are provided below, in a format compatible with Patrick Daly's natbib package.
\bibitem[Broos et al.(2002)]{Broos02} Broos, P. S., Townsley, L. K., Getman,
K., \& Bauer, F. E.\ 2002, ACIS Extract, An ACIS Point Source Extraction
Package (University Park: The Pennsylvania State Univ.)
\url{http://www.astro.psu.edu/xray/docs/TARA/ae\_users\_guide.html}
\bibitem[Townsley et al.(2003)]{TFM03} Townsley, L.~K.,
Feigelson, E.~D., Montmerle, T., Broos, P.~S., Chu, Y.-H., \& Garmire,
G.~P.\ 2003, \apj, 593, 874
\bibitem[Getman et al.(2005b)]{Getman05b} Getman, K.~V., et al.\
2005b, \apjs, 160, 319
A suitable bibliographic entry for those using a BibTex database is shown below.
@MANUAL{acis_extract,
TITLE = "ACIS Extract, An ACIS Point Source Extraction Package",
AUTHOR = "Patrick Broos and Leisa Townsley and Konstantin Getman and Franz Bauer",
ORGANIZATION = "Pennsylvania State University",
MONTH = oct,
YEAR = 2002,
NOTE = "\url{http://www.astro.psu.edu/xray/docs/TARA/ae_users_guide.html}"
}