Differantiate text of transmission mode variables in drop-down list for plotting

It would be useful to differentiate which variable that belongs to each transmission mode when there is several transmission modes on the same corridor. 

Here is an example on how it looks now:

<img width="1909" height="1101" alt="Image" src="https://github.com/user-attachments/assets/a63ffd30-cf4d-41c9-85e7-dda7dc8a9829" />