Dear Pablo,
Yes, now, everything works. Thanks a lot for Your help.
Best Regards,


>>> <> 07/31/20 10:13 PM >>>
Hi again PaweĊ‚,

I realized that `substutited` *returns* a new builder, and does not change it in-place. The docs of `magnetic_gauge` were misleading there.

You can simply replace
l_lead = l_lead.substituted(peierls='peierls_llead')
r_lead = r_lead.substituted(peierls='peierls_llead')

in your code, and should work.