Boxplot of the impact of the variation of the most important physical inputs on log L_BTO and on t_H. The black thick lines show the median of the data set, while the box marks the interquartile range, i.e. it extends form the 25th to the 75th percentile of data. The whiskers extend from the box until the extreme data. For each parameter p_i, the labels low, std and high refer to the values 1.00−Δp_i, 1.00, and 1.00 + Δp_i.