Fine-tuning

Definitions

"Inside the plane, half a dozen scientists are fine-tuning 10 kinds of weather sensors, including microwave and laser. They stay on board, monitoring their instruments, as pilots fly over pre-selected snowy mountains, and high, snowy mesas. They’re seeking accurate snow measurements, even when craggy peaks mean snow is at different levels in the peaks and the valleys. Even when trees and forests hide the snow."