Figure 12:

Error (ϵ) measured as the difference between manual ($h_m^f$) and automatic FHR ($h_a^f$) estimations for Guatemala RCT dataset. The shaded area represents the PPA bound, defined as no greater than 10 percent of the $h_m^f$. S stands for the number of segments, and in parenthesis is the percentage of segment satisfying the PPA bounds. Red line is the robust least square of ϵ along the manual FHR estimations ($ϵ=-38.63+0.28h_m^f;r^2=0.9962$).