Fig. 7

Histograms of variance reduction by sidereal filtering. a–c Variance reduction using sidereal filter without (green) and with (others) low-pass filtering (LPF) for north (a), east (b), and up (c) components of a baseline POTM-POTS. A cut-off period for LPF is 500 (red), 5000 (blue), and 20,000 (brown) seconds. d–f Same as a–c but for a baseline GODE-GODN. g–i Same as a–c but for a baseline TSK2-TSKB