demodulating {HEAD ~ a modulated signal} externally supplied to {TAIL ~ said first electrode} in the first liquid container 
externally supplied to
demodulating { HEAD ~ a modulated signal } externally supplied to { TAIL ~ said first electrode } in the first liquid container
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH