Starting frequency: 15.7864GHz => 870pA on FC6  Step size: 1MHz. Selected peaks shown. There were many smaller resonances in-between also.

Strong peaks at:

15.8594GHz => 7.5nA

15.9834GHz => 1.3nA

16.0354GHz => 1.3nA

16.107GHz => 1.5nA

16.183GHz => 0.9nA

16.247GHz => 1.4nA

16.284GHz => plasma extinguished

16.248GHz => plasma re-ignited

15.860GHz => 7.5nA

15.685GHz => 3.5nA

15.518GHz => 2.5nA

15.486GHz =>  27.5nA

15.479GHz => 4.3nA

15.277GHz => 2.8nA

15.130GHz => 3.7nA

15.035GHz => 6.2nA

14.903GHz => 3.8nA

14.799GHz => 2.6nA

14.763GHz => 11.8nA

14.554GHz => 8.8nA

14.455GHz => 4.2nA

13.588GHz => 1.1nA

13.398GHz => 3.0nA

13.281GHz => 2.7nA

13.223GHz => 7mA (unstable)

13.153GHz => 7.5nA (unstable)

13.061GHz => 10.0nA (unstable)

13.019GHz => 40.0nA

13.002GHz => 50.0nA (unstable)

12.986GHz => plasma extinguished

13.089GHz => plasma re-ignited

15.4798GHz => 30.0nA