admit comma separated port keys

Author: ferranAX

src/axiomatic/pic_helpers.py

@@ -121,7 +121,11 @@ def plot_interactive_spectra(
 
     # Defaults
     if spectrum_labels is None and isinstance(spectra, dict):
+        if isinstance(list(spectra.keys())[0], str) and all("," in key for key in spectra.keys()):
+            spectrum_labels = [f"T {port_in} -> {port_out}" for port_in, port_out in spectra.keys()]
+    elif isinstance(list(spectra.keys())[0], tuple) and len(list(spectra.keys())[0]) == 2:
         spectrum_labels = [f"T {port_in} -> {port_out}" for port_in, port_out in spectra.keys()]
+
     elif spectrum_labels is None:
         spectrum_labels = [f"Spectrum {i}" for i in range(len(spectra))]
     if vlines is None: