FIG. 1 is a front perspective view of a first embodiment of a shelf for refrigerator, showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left-side view thereof;
FIG. 5 is a right-side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof;
FIG. 8 is a rear perspective view thereof;
FIG. 9 is an enlarged view of the portion 9 in FIG. 1;
FIG. 10 is a front perspective view of a second embodiment of a shelf for refrigerator, showing my new design;
FIG. 11 is a front view thereof;
FIG. 12 is a rear view thereof;
FIG. 13 is a left-side view thereof;
FIG. 14 is a right-side view thereof;
FIG. 15 is a top view thereof;
FIG. 16 is a bottom view thereof;
FIG. 17 is a rear perspective view thereof;
FIG. 18 is an enlarged view of the portion 18 in FIG. 10;
FIG. 19 is a front perspective view of a third embodiment of a shelf for refrigerator, showing my new design;
FIG. 20 is a front view thereof;
FIG. 21 is a rear view thereof;
FIG. 22 is a left-side view thereof;
FIG. 23 is a right-side view thereof;
FIG. 24 is a top view thereof;
FIG. 25 is a bottom view thereof;
FIG. 26 is a rear perspective view thereof; and,
FIG. 27 is an enlarged view of the portion 27 in FIG. 19.
The even-dash broken lines illustrating portions of the shelf for refrigerator form no part of the claimed design. The dot-dash broken lines in the figures encircling enlargement portions of the claimed design form no part of the claimed design.