Error estimates (blue line, left ordinate) and CPU run time per data point (orange line, right ordinate) as a function of the moon diameter in Pandora’s numerical eclipse case (2) (see Sect. 2.5.2). The error refers to the absolute error in the flux of the transit light curve of an Earth-sized body in front of a Sun-like star. The error falls below 1 ppm for grid sizes > 25 px, which is Pandora’s default mode. Users of Pandora can choose suitable grad sizes depending on accuracy requirements.