Chris,

Good questions. I'm ashamed to say I really haven't scrutinized the study. I've been in a time crunch lately.

Just a guess without really looking at the the data, but it's possible the 42/16 was made specifically for the study and is not available, and the closest thing is 42/18 off the shelf. But that's just a guess.

I may have a more detailed version of study that Bill Cody sent me. I'll try and find the time to look.

If pigs could fly bacon would be harder to come by and there would be a lot of damaged trees.