A method of selectively etching organosilicate layers in integrated circuit fabrication processes is disclosed. In the case of compressing data, data except for the characterizing points is compressed. Also, a lighting device comprising a light emitter chip, and a lumiphor, a first surface of the chip facing a first region of the lumiphor, a second surface of the chip facing a second region of the lumiphor. The base further includes biasing capabilities disposed and structured to exert a sufficient, forwardly and outwardly directed force on the user’s ear to dispose and maintain it in the enhanced hearing orientation, when the base is in the operative position. The two portions are then expanded, constrained by the original perimeter, such that a region of interest includes overlapping portion that includes the boundary.