The ornamental design for a table base, as shown and described.
FIG. 1 is a perspective view of a table base according to the principles of the present invention;
FIG. 2 is an elevational view thereof; and,
FIG. 3 is a top plan view thereof.
The present application is directed to the design illustrated in the drawings. The other features of the drawings are not considered part of the design sought to be patented, and have accordingly been shown in broken lines.