Figure 11.

Left panels show the recordings of specific days at specific stations of the ENIGMA array, while right panels show the corresponding results obtained after the method of critical fluctuations (MCF) analysis of parts of the recordings (shown in red color on the total recordings) that were found to satisfy MCF criticality conditions: (a) Z component* of DIO on 2 June 2017, (b) H component of VLI on 3 June 2017, (c) D component* of DIO on 7 June 2017, (d) D component* of VLI on 7 June 2017, (e) Z component* of DIO on 9 June 2017, and (f) H component of VLI on 9 June 2017. (For interpretation of the references to colors, the reader is referred to the online version of this paper.). (* = For the specific recordings it was found necessary to add uniform noise in the range $\left[-{\epsilon }_0,{\epsilon }_0\right]$, with ${\epsilon }_0$ of the order of ${10}^{-2}$, after normalizing the analyzed time series excerpt in the range $\left[0,1\right]$, for the establishment of ergodicity that is necessary for the application of MCF [21]).