Here's a nice easy spreadsheet that I threw together for those with very uneven MAF curves:
https://dl.dropboxusercontent.com/u/...omparison.xlsx
It's designed so that you can paste in your MAF curve and compare differing smoothing factors. It compares your curve against the OEM curve and the smoothing is based on that. It's a little different to the one applied in the java tool as it doesn't take into account your previous MAF scaling, just the original one. The idea is that if you've done multiple re-scales that you can see how it compares to stock.
You can input an auto smoothing function out of the 5 available or create your own curve by copy and paste by picking and choosing what you want.