|-ckptlist | viewhist.4.* | |-ckptquery | viewhist.4.* | -The second number is the granularity of data. The *.0 file is the highest sampling frequency but shortest period covered while the *.2 is the lowest sampling frequency but the longer period covered. +The second number is the granularity of data. The *.0 file is the highest sampling frequency but shortest period covered while the *.2 is the lowest sampling frequency but the longer period covered. The *.1 files contain samples 1/4th as often as the *.0 files, while the *.2 files contain samples 1/4th as often as the *.1 files (or 1/16th as often as the *.0 files). {subsection: File format}