It's a good point. One thing that would have been nice to see is a graph with several lines. X-axis is bits of entropy, Y-axis is recall rate. The individual

It's a good point. One thing that would have been nice to see is a graph with several lines. X-axis is bits of entropy, Y-axis is recall rate. The individual lines reflect a single combination of (a) formatting scheme (e.g. diceware) and (b) reinforcement mechanism (e.g. type 20x once per day). I've run this experiment on myself and found that diceware with intra-word punctuation gives the highest entropy at the lowest effort.