Data is split into separate files, each containing data from 30 days.
Raw values have been pre-computed to one value per minute using the average value of the raw measurements. This allows proper aggregation of multiple minute-based values, assuming all value timings are strictly spread within this minute.
Raw values have been pre-computed to show the highest recorded frequency drop (in Hz) around the full-hour marks. This is the delta between the highest and lowest mains frequency in a window of plus/minus 10 minutes around the full-hours marks.
No pre-computing has been done. Files contain the raw measurements on a 5-second time base (10 seconds as of 2023).