| http://www.w3.org/ns/prov#value | - l stability of the MOE component is enhanced as a result of maintaining the pitch of such optically active relief features and by minimising the volume of that material which has a relatively high thermal expansion coefficient. [0070] In order to facilitate the curing of the resin it is preferred to use an initiator, for example a thermal and/or photoinitiator and particularly an initiator which d
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