Fig. 1

The 90th percentile of the hourly S4 index S90 as a function of local time and date throughout July 2014, as detected by a BKK, b BNG, and c CAL GPS stations. Gray cells indicate data gaps
The 90th percentile of the hourly S4 index S90 as a function of local time and date throughout July 2014, as detected by a BKK, b BNG, and c CAL GPS stations. Gray cells indicate data gaps