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Finding out ORGX ORGY: Difference between revisions
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The correct | The mathematically correct definition of ORGX ORGY is: "the point of the detector (in pixels) closest to the crystal". However, in practice (namely for the standard setup of a beam perpendicular to the detector plane) the best way to come up with good values of ORGY ORGY is to find out where the direct beam would hit the detector. | ||
There are different possibilities to find out where the direct beam would hit the detector: | There are different possibilities to find out where the direct beam would hit the detector: | ||
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d) use ice rings to find out where the direct beam would be. This should be rather accurate but may be tedious. | d) use ice rings to find out where the direct beam would be. This should be rather accurate but may be tedious. | ||
The error you make in the determination of ORGX ORGY should be less than half of the distance between two spots. If you have a reasonable estimate, but the error is bigger than that, you can still find out the true ORGY ORGY by inspecting [[IDXREF.LP]] . | The error you make in the determination of ORGX ORGY should be less than half of the distance between two spots. If you have a reasonable estimate, but the error is bigger than that, ''you can still find out the true ORGY ORGY by inspecting [[IDXREF.LP]] . This works best if [[COLSPOT]] has seen a significant fraction of all frames.'' | ||