FKB/NFOV/M1 - Intermittent problem with channel 870

At times channel 870 is erratic.  Fortunately, it is mostly at night when it is not 
functioning properly.  The erratic behavior is infrequent until Sept when it becomes a bit more 
frequent.  Even then, however, very little daytime data are affected.

• Calibrated zenith radiance, 870 nm(radiance_870nm)
• Raw counts from instrument before calibration, 870 nm(raw_counts_870nm)