The method of measurement was not specified.
It is stated in the paper that Henry's law is obeyed. A check of the data shows that Henry's law is only very approximately obeyed.
Henry's constants, H in mm Hg/mole fraction, as determined by the authors and as calculated by the compiler are as follows: (authors) (compiler)
t/°C 102H 102H
20 3920 2927
0 4025 3714
20 5830 6000
35 6380 6222
50 7090   ; 7407
65 9350 13,333