The next step is a cross-rotation function with the modified Fab structure.
The model Patterson map P1 is computed
by placing the search model into a
Å orthorhombic box, with the largest
extent of the model approximately parallel to the **z**-direction,
and evaluating the structure factors and
FFT of the squared amplitudes.
Note that all
crystallographic symmetry operators of the space group
have to be specified without the translational part.

X-PLOR produced the following list of highest rotation function peaks:

! index, theta1, theta2, theta3, RF-function (EPSIlon= 0.25) 1 14.843 70.000 256.306 4.7813 2 14.460 70.000 75.923 4.7643 5 20.250 77.500 92.250 4.6747 6 3.549 67.500 260.049 4.6676 8 74.504 82.500 262.163 4.6273 9 3.173 67.500 79.673 4.6189 10 20.419 80.000 270.854 4.6173 ...You may notice that the first two peaks are related by non-crystallographic symmetry. However, this is only a necessary but not a sufficient condition for the correctness of the solution. In fact, this ``solution" is totally wrong.

Sat Mar 11 09:37:37 PST 1995