Solar cooker test data per ASAE S580.1 NOV2013 (American Society of Agricultural and Biological Engineers): Standardized cooking power versus temperature difference (cooking vessel contents and ambient air).  See Figure 2 in published manuscript.
Solar cooker test data per ASAE S580.1 NOV2013, Testing and Reporting Solar Cooker Performance, American Society of Agricultural and Biological Engineers, St. Joseph, Michigan, USA.  Standardized cooking power (watts) versus temperature difference (degrees C) between cooking vessel contents and ambient air. See Figure …