Base

FIG. 1 is a front, right, top perspective view of a base, showing the new design;

FIG. 2 is a rear, right, top perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a front elevation view thereof;

FIG. 6 is a rear elevation view thereof;

FIG. 7 is a right side view thereof; and,

FIG. 8 is a left side view thereof.

The broken lines of uneven length illustrate the boundary of the claimed design and form no part thereof. The broken lines of even length depict portions of the base that form no part of the claimed design.