NSA/VCEIL/C1 - Small gaps in data

When the ceilometer was replaced, small gaps in the netCDF files occurred due to the 
presence of '?' characters in the backscatter and header records of the raw data that could 
not be ingested. It is unknown whether this was caused by a poor CPU board or 
incompatibilities with the computer configuration (hyper-threading). The problem was corrected when 
the instrument and computer were both replaced. 

During this period, approximately 3% of data are missing each hour due to this problem.

• Third cloud base height(third_cbh)
• alt_highest_signal
• receiver_sensitivity
• laser_temperature
• Second lowest cloud base height(second_cbh)
• Lowest cloud base height detected.(first_cbh)
• Vertical visibility(vertical_visibility)
• tilt_angle
• time_offset
• measurement_parameters
• status_flag
• sum_backscatter
• range
• base_time
• Backscatter(backscatter)
• status_string
• background_light
• window_contamination
• laser_pulse_energy
• detection_status