Is all of this data from prime runs, or has one group been run more than once? Average internal humidity will tend to drop with re-runs, and can also vary significantly depending on where and how long the drives were stored. In addition, there are often small variances build to build (though they are usually much smaller than this difference).
Rory and I will take a look at the MAT 3.2 data (which we are doing anyway); we'll let you know if we observe any difference there.สามหมื่นหนึ่งห้าพันบาท