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Hawkeye is a combination cloud particle probe. The instrument includes four probes in one.
Probe 1: The Fast Cloud Droplet Probe (FCDP) records individual particle statistics and digitizes waveform.
Probes 2-3: 2D-S 10-µm channel and 50-µm channel also trigger CPI.
Probe 4: 400 frame per second Cloud Particle Imager (CPI).