**Description of the error** When I plot the vector positions, the 3D q-vector plot is flat when any reciprocal space unit is used other than 1/ang. 1/ang <img width="661" height="667" alt="Image" src="https://github.com/user-attachments/assets/303f8275-ae08-41df-b0b0-54fb9c3e3e9c" /> 1/nm <img width="680" height="706" alt="Image" src="https://github.com/user-attachments/assets/dd0c8780-a8b7-4647-9779-9dbf5e24bc79" /> 1/pm <img width="662" height="573" alt="Image" src="https://github.com/user-attachments/assets/97437bf4-6915-4d43-980a-36dc27479767" />
Description of the error
When I plot the vector positions, the 3D q-vector plot is flat when any reciprocal space unit is used other than 1/ang.
1/ang
1/nm
1/pm
