3 4 5 6 7 8 20 40 60 80 100 GLYPH<AY> GLYPH<B4>GLYPH<BC>GLYPH<B5> GLYPH<AM> GLYPH<B4>GLYPH<BC>GLYPH<B5> FIG. 11: The regions of the Casimir repulsion (above the solid line) and attraction (below the solid line) in the [ ε (0) , µ (0)]-plane. See text for further discussion. 41