Labels:text | rectangle | pattern | diagram | screenshot | line OCR: Case 0 Case 1 Case 2 Case 3 Case 4 Case 5 Case 6 Caso 7 Caso 8 Case 9 Case 10 Case 11 Case 12 Case 13 Case 14 Case 15 Figure 2: Sixteen marching squares cases. Dark vertices bave scalar value above contour value