The broken line immediately adjacent to the shaded area represents an unclaimed boundary of the design. The broken-line showing of eight regions within the shaded area and the unshaded areas encompassed there within are for environmental purposes only and form no part of the claimed design. The broken lines showing the remainder of the electronic tablet are for environmental purposes only and form no part of the claimed design. The difference in shading indicates a contrast of appearance and does not depict any particular color, texture, or material.