MAO/MET/M1 - Optical rain gauge performance problems

Condensation inside the optical rain gauge lenses caused false precipitation to be 
recorded. Sensor replacements also showed signs of false precipitation. User discretion advised.

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• ORG precipitation rate standard deviation(org_precip_rate_std)
• ORG precipitation rate minimum(org_precip_rate_min)
• ORG precipitation rate maximum(org_precip_rate_max)
• ORG precipitation rate mean(org_precip_rate_mean)