Re: ISIS vs XSPEC

From: Hironori Matsumoto <matumoto>
Date: Wed, 19 Dec 2001 18:18:51 -0500 (EST)
In article <200112192305.SAA18829_at_email.domain.hiddendavis writes:

>> Hironori Matsumoto <matumoto> wrote:
>> >Why the best-fit chi^2 values are so different between ISIS
>> >and XSPEC?
>> [...]
>> >chi^2          550                     607.86
>> 
>> What chi^2 do you get in isis using the xspec parameter values?  What
>> chi^2 does xspec produce when given the isis values?

When I used the best-fit ISIS values for XSPEC,
            ISIS             XSPEC
chi^2       550              615.84

When I used the best-fit XSPEC values for ISIS,
            ISIS             XSPEC
chi^2       557.2            607.86

They are still different.

Thanks,
Hironori

==============================================================
Hironori MATSUMOTO
Center for Space Research
Massachusetts Institute of Technology
NE80-6045
77 Massachusetts Avenue
Cambridge, MA02139-4307, USA
TEL: USA(1)-(617)253-8008
FAX: USA(1)-(617)253-8084
e-mail : matumoto_at_email.domain.hidden==============================================================
Received on Wed Dec 19 2001 - 18:18:51 EST

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