The ornamental design for a cellularmaterial for windowcoverings, as shown and described.
FIG. 1 is a perspective view of my cellular material for window coverings in a fully lowered position;
FIG. 2 is a left side elevational view thereof, the right side view being a mirror image thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a top plan view thereof; and,
FIG. 6 is a bottom plan view the thereof.
A headrail drawn in dot dash dot broken line in the figures represents environmental structure and forms no part of the claimed design.
The cellular material for window coverings is shown with a symbolic break in its width. The appearance of any portion of the article between the break lines forms no part of the claimed design.