Before optimizing parameters, we need a good estimate for the angular width of the detector. This is accomplished by marking the positions of two of the Bragg rings that you will use for calibration.You should see on the false color image two blue cursor dots. Drag one of these cursors to the lowest-angle ring that you will use for calibration and the other to the highest-angle ring. Important: These must be the lowest- and highest-angle rings that you are actually going to use for calibration, not other rings that might be on the image and not intermediate-angle rings. If this step is not done correctly, it is unlikely that the rest of the calibration process will be successful. |