The li entry contains information about a specific line of source code, which is inside the function named in the surrounding fu and efu lines. It contains the data fields:
li <source line #> <# hits>
The <source line #> field gives the line number within the source file. Because it is possible to have multiple functions on the same line of code, source line numbers are not necessarily unique within the export file.
The <# hits> field gives the number of times that specific source line was used in all the sessions contributing to the total for that file.