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Re: wiggles


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Re: wiggles



I was also going to mention this: trl1_theta is recorded with
as xx.x degrees, so your bins need to be a multiple of 0.1 degrees.
(for example, define 100 bins from 0 to 50 deg.)

Prof. Peter Bosted
email: bosted@jlab.org
phone: (757) 269-5851
address: Jefferson Lab Suite 6, 12000 Jefferson Ave, Newport News VA 23606

On Thu, 14 Feb 2008, Maurik Holtrop wrote:

> Sebastian,
>
> I cannot remember for sure, but I seem to remember that there was an
> issue with bit-truncation in the DST, so that the histogram would look
> incorrect depending on how well the bits of the number plotted
> correspond to the binning chosen. Do the wiggles look different if you
> change the binning slightly?
>
> Best,
> 	Maurik
>
> On Feb 14, 2008, at 4:09 PM, Sebastian Kuhn wrote:
>
> > Dear (former) EG1ers (and especially "oldtimers"),
> >
> > I am trying to remember what our final conclusion was regarding the
> > infamous "wiggle/theta oscillation" problem with EG1a - see http://www.jlab.org/ccc/mail_archives/CLAS/eg1_run/msg00274.html
> >  to jog your memory. I went through all my accumulated notes but
> > couldn't find any conclusive solution (and my memory is just not as
> > good as it used to be... ;-)
> > It appears possible that we have a similar problem in EG1b, see
> > http://www.jlab.org/Hall-B/secure/eg1/EG2000/sharon/theta_compare/theta_compare_5_6.gif
> >  (and BoNuS, for that matter! -> http://www.jlab.org/~slava/Check44/Check44_18/ThetaEL/thetael_raw_0211_44_1_pre_el5gev.jpg
> >  ).
> >
> > Any recollections are welcome - Sebastian
>
>