For the infrared calibrations, the two- and four-component net radiometers yielded average root mean square errors of 0.88 and 0.97 W m−2 respectively compared to 0.92 W m−2 for the polyethylene-domed net radiometers, 2.59 W m−2 for four domeless units and 2.27 W m−2 for a polyethylene-domed miniature net radiometer.