Yes, oops, silly me!
> -----Original Message----- > From: Ronald E Stenkamp [mailto:[EMAIL PROTECTED] > Sent: Thursday, December 11, 2008 12:24 PM > To: Borhani, David > Subject: Re: [ccp4bb] About system absence in P4222? > > Hi. > > Maybe you made a typo in your message? In P4(2)22, the 0 0 l > (l=2n) are present. The absences are 0 0 l (l=2n+1). > > Ron > > > On Thu, 11 Dec 2008, Borhani, David wrote: > > > Jaishin, Are we understanding your original question? > P4(2)22 of course has systematic absences, [0 0 l] = 2n. Dave > >> -----Original Message----- > >> From: CCP4 bulletin board [mailto:[EMAIL PROTECTED] On > >> Behalf Of Eleanor Dodson > >> Sent: Thursday, December 11, 2008 7:28 AM > >> To: CCP4BB@JISCMAIL.AC.UK > >> Subject: Re: [ccp4bb] About system absence in P4222? > >> > >> I hate scalepack for this - it only lists absences and not > the other > >> axial reflections so you dont get a comparative scale.. > >> SCALA is much more informative.. > >> > >> > >> And it is always a bit dodgy basing the choice of space group on 3 > >> absences alone, > >> However after that gripe, indeed all 3 have I <<< 3SigI so > >> the evidence > >> is for P4(2) 22 > >> > >> In general you only think a reflection is present if it is > > >> 4 or 5 Sig > >> but I base all that partly on the relative size of the 00 > 2l, and 00 > >> 2l+1 sets. > >> > >> Eleanor > >> > >> > >> 劉家欣(NTHU) wrote: > >>> Dear Prof. Dodson: > >>> > >>> Thank you for your kindly suggestions. > >>> Actually, the sg we predicted was P4222. However, the systematic > >>> absence was > >>> showed alone 00l in the log file(In below). > >>> Is ant conflict on that? > >>> Thanks again I appreciated. > >>> > >>> Sincerely, > >>> > >>> > >>> jaishin > >>> > >>> Intensities of systematic absences > >>> h k l Intensity Sigma I/Sigma > >>> > >>> 0 0 17 -5.3 21.3 -0.2 > >>> 0 0 19 7.2 24.9 0.3 > >>> 0 0 21 -13.4 22.0 -0.6 > >>> > >>> ----- Original Message ----- From: "Eleanor Dodson" > >>> <[EMAIL PROTECTED]> > >>> To: ""劉家欣(NTHU)"" <[EMAIL PROTECTED]> > >>> Cc: <CCP4BB@jiscmail.ac.uk> > >>> Sent: Thursday, December 11, 2008 5:41 PM > >>> Subject: Re: [ccp4bb] About system absence in P4222? > >>> > >>> > >>>> 劉家欣(NTHU) wrote: > >>>>> Dear All: > >>>>> > >>>>> We have a crystl with P4222 sg. > >>>>> All statistics look fine. > >>>>> However, there is a system absense in l axis. > >>>>> Any body have experiences on that? > >>>>> Any suggestions would be high appreciated. > >>>>> > >>>>> jaishin > >>>>> > >>>> can you give more details, eg all reflections along the > particular > >>>> axis.. > >>>> Things like ice rings or overlapping intensity from a next > >> neighbour > >>>> getting integrated inapropriately can cause anomalies.. > >>>> Eleanor > >>>> > >>> > >>> > >>> > >> > > > > >
