Re: [phenixbb] question on f/sigf

Hi, I think that the math you're looking for is on p. 329 of Rupp's book BMC (eqs. 7-47 - 7-50). Cheers, Boaz Boaz Shaanan, Ph.D. Dept. of Life Sciences Ben-Gurion University of the Negev Beer-Sheva 84105 Israel E-mail: [email protected] Phone: 972-8-647-2220 Skype: boaz.shaanan Fax: 972-8-647-2992 or 972-8-646-1710 ________________________________________ From: [email protected] [[email protected]] on behalf of [email protected] [[email protected]] Sent: Saturday, July 14, 2012 1:52 AM To: PHENIX user mailing list Subject: Re: [phenixbb] question on f/sigf thank you! Quoting Nathaniel Echols :

On Fri, Jul 13, 2012 at 2:25 PM, wrote:

...

I am wondering why f/sigf is always about twice of i/sigi. Is there any mathematics behind this relation? Maybe it is not directly related to phenix, but i sincerely hope someone could help me with it.

I don't know the logic behind this, but from notes in our code, the default implementation appears to be this one:

http://www.iucr.org/__data/iucr/cif/software/xtal/xtal372htmlman/html/addref...

specifically, section 4.5.2.4.

-Nat

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