Outdoor performance compared to indoor performance at 1000 W/m² of the rear component only. G_rear is the additional rear irradiance. G_total is the corresponding total irradiance from the rear only to achieve the necessary injection level. The module temperature is uncontrolled and varies between 5 and 39 °C, due to outdoor temperature variations between 2 and 21 °C. The error bars are at k = 2 of all measurement data points. Approximately 400 datapoints are contained in each outdoor data point.