South_America: DNI, stddev (W/m2)
site CAC FLO^ NAT* PET^ SAO^ Mean Std
model              
SOLARGIS 149.9 132.6 136.8 171.3 119.1 147.6 17.4
CAMS_v3.2 155.6 163.6 149.7 161.2 147.0 157.5 6.2
DWDSARAH 170.3 167.9 146.2 157.2 147.9 160.4 11.0
METEOTEST 174.5 181.6 168.2 195.0 nan 179.8 11.5
CAMS_pre-v4 178.9 182.5 235.1 197.9 169.3 198.6 25.7
CERES 421.9 444.1 338.4 421.8 459.6 406.5 46.6
NSRDBGOES nan nan 188.0 208.2 nan nan nan