Design for a tab portion of a shingle
FIG. 1 is a front elevational view of a tab portion of a shingle showing our new design; 
     FIG. 2 is a right side elevational view thereof; 
     FIG. 3 is a bottom view thereof; 
     FIG. 4 is a front elevational view of a second embodiment of a tab portion of a shingle showing our new design; 
     FIG. 5 is a bottom view thereof; 
     FIG. 6 is a front elevational view of a third embodiment of a tab portion of a shingle showing our new design; 
     FIG. 7 is a bottom view thereof; 
     FIG. 8 is a front elevational view of a fourth embodiment of a tab portion of a shingle showing our new design; 
     FIG. 9 is a bottom view thereof; 
     FIG. 10 is a front elevtional view of a fifth embodiment of a tab portion of a shingle showing our new design; 
     FIG. 11 is a bottom view thereof; 
     FIG. 12 is a front elevational view of a sixth embodiment of a tab portion of a shingle showing our new design; 
     FIG. 13 is a bottom view thereof; 
     FIG. 14 is a front elevational view of a seventh embodiment of a tab portion of a shingle showing our new design; 
     FIG. 15 is a right side elevational view thereof; 
     FIG. 16 is a bottom view thereof; 
     FIG. 17 is a front elevational view of an eighth embodiment of a tab portion of a shingle showing our new design; 
     FIG. 18 is a bottom view thereof; 
     FIG. 19 is a front elevational view of a ninth embodiment of a tab portion of a shingle showing our new design; 
     FIG. 20 is a bottom view thereof; 
     FIG. 21 is a front elevational view of a tenth embodiment of a tab portion of a shingle showing our new design; 
     FIG. 22 is a bottom view thereof; 
     FIG. 23 is a front elevational view of an eleventh embodiment of a tab portion of a shingle showing our new design; 
     FIG. 24 is a bottom view thereof; 
     FIG. 25 is a front elevational view of a twelfth embodiment of a tab portion of a shingle showing our new design; and, 
     FIG. 26 is a bottom view thereof. 
     The broken lines showing the head lap segments of each embodiment are for illustrative purposes only and form no part of the claimed design. The rear view of the tab portion of the shingle, in each embodiment, is plain and unornamented.