Percentage of the main populations of hydrogen atoms in IMO-CH₃ samples. The values obtained for the dry sample are given for the purpose of comparison.

Hydration (RH%)	% H from H2O molecules (external water)	% H from OH groups (outside the tubes)	% H from CH3 groups (inside the tubes)
Dry sample	0	50	50
3%	17.2	41.4	41.4
11%	26.4	36.8	36.8
43%	42.0	29.0	29.0