Store the NeffFinder results in a histogram (easier to track than log files).
The output ROOT file from NeffFinder is now called NeffInfo_.... The histogram with neff info is also called NeffInfo_.... The TrueNumInteractions_... histogram is also present in that file.
The four bins in the NeffInfo_... histogram correspond to neff (pos-neg), pos, neg, and tot (pos+neg).
I confirmed that the content in the histogram is the same as what getResults.py would return after aggregating the log files.