Same as Fig. 6 but for case 2: the “Flat2” profile. Additionally, a closed circle symbol is used to represent runs that completed successfully but with results that do not meet the accuracy criteria outlined in the text. For example, the Wagoner’s method run for S_scale = 10 and Y_t,min = 10^-1 reports successful completion, but computes an abundance for ⁴He that exceeds the correct result by a factor of roughly 10.