Line-core Doppler-velocity time series extraction
Dr. Wave discovered that using many 'sensors' (or colors) along this one stretch made it easier to see a complete map of oscillations and understand how they were interconnected in their dance across Alex's surface.
Technical definition
Line-core Doppler-velocity time series extraction is a data analysis technique used to extract information on the velocity of plasma within sunspots by analyzing changes in spectral line absorption profiles.