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Synrad tutorial: basics = # Interface elements ![](https://codimd.web.cern.ch/uploads/upload_d8bbc06aeff19c7272102afe687df8e3.png) # Angles **Theta** [-PI..PI]: angle with Z axis in XZ plane, positive if X<0 ![](https://codimd.web.cern.ch/uploads/upload_152caec35f7d22840ae1030e6c549962.png) **Alpha** [-PI/2..PI/2]: angle with XZ plane, positive if Y<0 ![](https://codimd.web.cern.ch/uploads/upload_6a258b86c4e77c26f3d505d7e4483594.png) [More info](https://molflow.web.cern.ch/content/documentation-region-editor)