“…1) We demonstrated the pyramid effect that affects the biosensors placed at the PS apex by the potential power of the PS. When the year was divided into two periods, the spring equinox and the autumn equinox, a significant difference was obtained as a result of comparing the pyramid effects of each period, p = 6.0 × 10 −3 , Welch's t-test, two-tails [27] (the following p values are also the Welch's t-test values). 2) We demonstrated that the potential power of the PS affected the biosensors placed in two layers with a difference of 20 mm in height at the PS apex, and the pyramid effect differed between the lower and the upper layer.…”