SGP/CEIL/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.

• alt_highest_signal
• second_cbh
• backscatter
• first_cbh
• detection_status
• third_cbh
• sum_backscatter
• background_light
• vertical_visibility