> Maybe I am misunderstanding what you said in your last note, but
> the beam energy and holding field are directly incorporated into the
> analysis because they determine the angle between the q-vector and
> the spin direction, the single largest source of systematic error
> in the analysis of the asymmetries. If they are different than the
> demand values, it is critical to know what they are on a run by run
> basis.
>
You are quite right. What I meant to say is that they do not change run by
run. For the holding field one will have to use measured data (the holding
field direction vs z) but those are measuraments other than coda runs or
they do not affect reconstruction.
And at any rate we are dealing with a E-logbook. It makes sense to me to
group all runs with holding field angle of 45.0 and 44.9 in the same
"batch" (or with h.f. angle of 0 and -1.4).
The true holding field value is in the epics data in those runs. Not in
the E-logbook.
> John
>
>
>
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