FIG. 1 is a first perspective view of a portion of a bathtub showing our new design;
FIG. 2 is a second perspective view thereof;
FIG. 3 is a third perspective view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a side elevational view thereof, the opposite side being a mirror image thereof;
FIG. 6 is an elevational view of a first end thereof; and,
FIG. 7 is an elevational view of a second end thereof taken opposite FIG. 6.
The broken lines are for illustrative purposes only and form no part of the claimed design.