Table 2
Arc detections in the 4 selected HST clusters.
| Category | SExtractor | ANN | |||||
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| Cluster | A | B | C | Not detected | Blended | Arc detections | N f |
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| Abell 68 | 9 | 2 | 1 | a9 | a2, a3, a4, b1 | a6, a7, a8, b2 | 12 |
| Abell 383 | 7 | 4 | 2 | a5, b1, b4 | a7, b2, c2 | a1, a2, a5, a6, b4, c1 | 3 |
| Abell 773 | 1 | 1 | 1 | – | a1 | c1 | 13 |
| Abell 963 | 7 | 3 | 1 | – | a1, a3, a6 | a2, a5, a7, b2, b3 | 15 |
Notes. Columns 2 to 6: number of arc candidates visually identified in each category (A, B, and C), objects that are not detected by SExtractor, and arcs that are blended with other objects. Column 7 shows the arcs detected by the ANN for configuration D and t = −0.75. The last column shows the number of false positives (i.e., objects classified as arcs but not on the arc truth table) for the same configurations.
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