Fig. 8

Cross-validation between shear probes and FP07 for three different time response corrections. Heatmap plot showing the probability density distribution of the estimates of ε from shear probe 1 versus FP07 1 and 2, according to the time response correction described in the Methods section (a), and the approaches proposed by³⁶ (b) and by⁴⁰. The estimates rejected at least for one of the sensors are depicted in gray. For the details of the figure see the caption of Fig. 5. As a side comment, we note that part of the rejected estimates at the right of the 1:1 line are ascribable to the pyroelectric effect, whereby ε_S is skewed to higher values compared to ε_T (see text and circle in subplot (a)).