|-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.
+
 {subsection: File format}
 
 This is the format of the various viewhist.*.* files. Because -orgformat returns the same information, this is also the format of -orgformat's output. In the actual output fields are seperated by spaces, records are seperated by newlines.