SGP/NFOV/C1 - Condensation on window
The single-channel NFOV had a condensation problem. Water made its way into the interior of the instrument and condensed on some of the important optical components of the system. The condensation resulted in the signal strength of the 1-NFOV being significantly less than that of the 2-NFOV.
Compare data with the 2-channel NFOV to determine on which days the problem occurred.