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(vertical_visibility)
• alt_highest_signal
• Second lowest cloud base height(second_cbh)
• Backscatter(backscatter)
• Third cloud base height(third_cbh)