FIG. 1 is a front perspective view of a first embodiment of an ornamental design for a user interface;
FIG. 2 is a rear perspective view of the first embodiment thereof;
FIG. 3 is a front view of the first embodiment thereof;
FIG. 4 is a rear view of the first embodiment thereof;
FIG. 5 is a first side view of the first embodiment thereof;
FIG. 6 is a second side view of the first embodiment thereof;
FIG. 7 is a top view of the first embodiment thereof; and
FIG. 8 is a bottom view of the first embodiment thereof.
FIG. 9 is a front perspective view of a second embodiment of an ornamental design for a user interface;
FIG. 10 is a rear perspective view of the second embodiment thereof;
FIG. 11 is a front view of the second embodiment thereof;
FIG. 12 is a rear view of the second embodiment thereof;
FIG. 13 is a first side view of the second embodiment thereof;
FIG. 14 is a second side view of the second embodiment thereof;
FIG. 15 is a top view of the second embodiment thereof; and
FIG. 16 is a bottom view of the second embodiment thereof.
FIG. 17 is a front perspective view of a third embodiment of an ornamental design for a user interface;
FIG. 18 is a rear perspective view of the third embodiment thereof;
FIG. 19 is a front view of the third embodiment thereof;
FIG. 20 is a rear view of the third embodiment thereof;
FIG. 21 is a first side view of the third embodiment thereof;
FIG. 22 is a second side view of the third embodiment thereof;
FIG. 23 is a top view of the third embodiment thereof; and
FIG. 24 is a bottom view of the third embodiment thereof.
FIG. 25 is a front perspective view of a fourth embodiment of an ornamental design for a user interface;
FIG. 26 is a rear perspective view of the fourth embodiment thereof;
FIG. 27 is a front view of the fourth embodiment thereof;
FIG. 28 is a rear view of the fourth embodiment thereof;
FIG. 29 is a first side view of the fourth embodiment thereof;
FIG. 30 is a second side view of the fourth embodiment thereof;
FIG. 31 is a top view of the fourth embodiment thereof; and
FIG. 32 is a bottom view of the fourth embodiment thereof.
FIG. 33 is a front perspective view of a fifth embodiment of an ornamental design for a user interface;
FIG. 34 is a rear perspective view of the fifth embodiment thereof;
FIG. 35 is a front view of the fifth embodiment thereof;
FIG. 36 is a rear view of the fifth embodiment thereof;
FIG. 37 is a first side view of the fifth embodiment thereof;
FIG. 38 is a second side view of the fifth embodiment thereof;
FIG. 39 is a top view of the fifth embodiment thereof; and
FIG. 40 is a bottom view of the fifth embodiment thereof.
FIG. 41 is a front perspective view of a sixth embodiment of an ornamental design for a user interface;
FIG. 42 is a rear perspective view of the sixth embodiment thereof;
FIG. 43 is a front view of the sixth embodiment thereof;
FIG. 44 is a rear view of the sixth embodiment thereof;
FIG. 45 is a first side view of the sixth embodiment thereof;
FIG. 46 is a second side view of the sixth embodiment thereof;
FIG. 47 is a top view of the sixth embodiment thereof; and
FIG. 48 is a bottom view of the sixth embodiment thereof.
FIG. 49 is a front perspective view of a seventh embodiment of an ornamental design for a user interface;
FIG. 50 is a rear perspective view of the seventh embodiment thereof;
FIG. 51 is a front view of the seventh embodiment thereof;
FIG. 52 is a rear view of the seventh embodiment thereof;
FIG. 53 is a first side view of the seventh embodiment thereof;
FIG. 54 is a second side view of the seventh embodiment thereof;
FIG. 55 is a top view of the seventh embodiment thereof; and
FIG. 56 is a bottom view of the seventh embodiment thereof.
FIG. 57 is a front perspective view of a eighth embodiment of an ornamental design for a user interface;
FIG. 58 is a rear perspective view of the eighth embodiment thereof;
FIG. 59 is a front view of the eighth embodiment thereof;
FIG. 60 is a rear view of the eighth embodiment thereof;
FIG. 61 is a first side view of the eighth embodiment thereof;
FIG. 62 is a second side view of the eighth embodiment thereof;
FIG. 63 is a top view of the eighth embodiment thereof; and,
FIG. 64 is a bottom view of the eighth embodiment thereof.
The broken lines shown in the drawings illustrate portions of the wrist worn user interface that form no part of the claimed design.