Keep it simple

After fooling around with trying to find and extract the linear region of my graph, I decided to just punt. I have a number of these graphs and the linear regions are all about at the same place, so the simple thing to do was just grab the data in that region and run least-squares to get a fit. The coefficient of regression is coming in at around .998, so that's a pretty good fit. Sometimes the really simple solution is the best one.