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The Vt close-curve measurement shows that there exists a surface (X-Y) discharge contour in spite of a large sustain gap of 200 mum greater than a barrier rib height of 125 mum. This indicates that there are two different discharge modes, i.e., one mode is to produce the surface discharge, and the other is to produce the surface discharge including the plate gap discharge. The two discharge modes are examined and analyzed based on the Vt close-curve movement on the cell voltage plane. The two discharge modes show the different discharge characteristics such as the sustain voltage level, Vt close-curve behavior, luminance, and luminous efficiency. In addition, the spatial wall charge, electron density behaviors, and their current flows as a function of time are investigated in detail using the numerical analysis.