| http://www.w3.org/ns/prov#value | - The modulus of elasticity for both the gusset and the elastic cuff 170 can be more or less than that stated above or modified to give the appropriate stretch characteristics in conjunction with the delivered mask pressure and headgear tension/strap displacement. [0165] In the embodiments described above, for example in relation to FIG. 1, a mask system and cushion provided with a gusset produces a
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