|-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}