Fig. 3

For low-, mid-, and high-latitude station bias calculation. Top row shows results for low-latitude, middle one for mid-latitude and bottom one for high latitude stations, respectively. Participating station pair’s codes are shown in the top left corner of each panel. Baseline distance between the two participating stations, mean and standard deviation of calculation errors are also shown at the top left corner. The frequency axis on each plot is different and set according to the number of days’ data available. The black dotted line in the middle of each plot shows the zero difference line between calculated and available station bias