FIG. 1 is a perspective view illustrating the top, front and right side of a butterfly-style, inside out heat sink wing portion embodying our claimed design, wherein the broken-line disclosure illustrates an example intended environment of this example embodiment for illustrative purposes only and forms no part of the claimed design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a right side elevational view thereof, with the opposite side being a mirror image;
FIG. 5 is a rear elevational view thereof; and,
FIG. 6 is a bottom plan view thereof.