In this step, Datasqueeze uses the curvature of one of the Bragg rings to determine the approximate position of the beam center position (which may or may not be on the detector). Four blue control dots are shown. Drag them so that they all lie on top of one of the Bragg rings in the image, as widely spaced as possible. In the wizard box, be sure to correctly identify which ring you used.
Click Next when you are ready to go on to the next step, Back to return to the previous step, or Restore to abort the entire process.