Fig. 5From: Spatial gradients of geomagnetic temporal variations causing the instability of inter-station transfer functionsComparison of geomagnetic time-series data at three observatories. a Time-series data transformed from separated component \(Y_{m,d} \left( {0,f,t} \right)\) within the range of 30/30,720–95/30,720 Hz. b Raw time-series data filtered by a band-pass filter with the pass band between 30/30,720 Hz and 95/30,720 HzBack to article page