SGP/VCEIL/C1 - Range normalization

The range gate data were not normalized during this period because, when the CL31 was 
first deployed, I was uncertain about this parameter and returned it to its default setting 
of "off". Range gate normalization was enabled after receiving the following from Vaisala:

''We do recommend to keep this 'profile noise_h2' setting on. If 'profile noise_h2' is 
off, then range correction of the signal would freeze at 2400 m, unless the algorithm has 
detected a cloud region. This had been designed to make profiles in CL-VIEW look less noisy 
and to emphasize the presence of clouds.''

• Lowest cloud base height detected.(first_cbh)
• vertical_visibility
• alt_highest_signal
• Second lowest cloud base height(second_cbh)
• Normalized corrected relative backscatter(backscatter)
• Third cloud base height(third_cbh)

SGP/VCEIL/C1 - Contaminated window

Alarm shown: Light Path Obstruction and Window Contamination. Window condition was 2%. 
Observed massive amounts of bird droppings on window. Cleaned window and shortly after 
window condition had risen to 94% and alarm was cleared.

• Lowest cloud base height detected.(first_cbh)
• vertical_visibility
• sum_backscatter
• alt_highest_signal
• background_light
• Second lowest cloud base height(second_cbh)
• detection_status
• Normalized corrected relative backscatter(backscatter)
• Third cloud base height(third_cbh)