Fig. 3.

Exploratory variability control functions. The variability control function ${\sigma }_{\eta }^2=c·{\left({\overline{R_5}}^{0.7}-1\right)}^2$ has been fitted to the variances reported by Dhawale et al. (2019) (c = 19) and scaled to the variances reported by Therrien et al. (2018) (c = 54). This variability control function is used for scaling with the different input values of the exploration parameter ${\sigma }_{\eta }^2$ (Eq. 10)