The cumulative intensity depends on correctly estimating weak
reflections, so it is a bit vulnerable to the integration procedures.
I prefer the 4th moment of E - 2nd moment of I. Providing there is no
pseudo-translation they are pretty reliable indicators of twinning
Eleanor
Bryan W. Lepore wrote:
On Mon, 29 Oct 2007, Iain Kerr wrote:
The cumulative intensity distribution plot from crystal A did suggest
partial twinning (attached, doesn't look too bad though..)
notwithstanding other plots/statistics, does the cum. intens. dist.
plot (e.g. from truncate) really show a continuum from untwinned to
twinned?
i.e, if the plots are 'overlapped in the middle', no question -
twinned. but, if the plots are 'a little off, but not in the middle'
can this result (alone) really mean the data is - as we want to say -
partially twinned? i.e. is the plot robust only for the detection of
perfect twinning?
-bryan
