https://spacetelescope.github.io/jdat_notebooks/notebooks/specviz_notebookGUI_interaction/specviz_notebook_gui_interaction_redshift.htm <img width="885" alt="Screen Shot 2022-05-16 at 9 30 28 AM" src="https://user-images.githubusercontent.com/5994975/168604913-83207171-f1d3-4c05-a253-cf8113bb0984.png"> l
https://spacetelescope.github.io/jdat_notebooks/notebooks/specviz_notebookGUI_interaction/specviz_notebook_gui_interaction_redshift.htm
l