| http://www.w3.org/ns/prov#value | - yer formed of a material and thickness to maintain the complete seal during and after ablation of the energy-absorbing layer with a focused laser beam, said thickness being n(??/4) where ?? is the characteristic operating wavelength of the laser beam and n is an integer selected to displace optical obstructions on the surface of said layer from the focal plane of the laser beam. 3.
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