Fixed numbering of labels in plot_s_singular().
@@ -1164,7 +1164,7 @@ class VectorFitting:
# plot the frequency response of each singular value
for n in range(n_ports):
- ax.plot(freqs, singvals[n, :], label='$\sigma_{}$'.format(n))
+ ax.plot(freqs, singvals[n, :], label='$\sigma_{}$'.format(n + 1))
ax.set_xlabel('Frequency (Hz)')
ax.set_ylabel('Magnitude')
ax.legend(loc='best')
