Shown below is the projected electron density using the experimental
data at l=.01 for different scaling

factors. The scaling factor doesn't seem to have much effect
on the results over a reasonable

range. The extra oxygens that I had considered in the previous
results appear to have been

due to the scaling, however.

Scale = .40

Below is the same result as above, except I have made the projected
density slightly transparent

so that the bulk copper can be seen as represented by the smaller green
spheres. It occured to us

that the extra features (circled in yellow) in the density could be
additional reconstructed copper

atoms from further into the bulk. These features could also be
caused by improper scaling of the

ulk amplitudes although the fact that they appear regardless of the
scaling makes them seem

more real.

Here is a perspective view showing some of the bulk atoms.

An r-factor comparison of the model with the data as a function of just
the scale factor gave

Scale=.365 as the optimal. Our algorithm
gave virtually the same result

as scale=.4 when run with this scale.

Here are a couple more results with different scale factors.

Scale=.25

Scale=.70