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| d1 [cm] | 60 | 60 | 60 | 60 | 40 | 40 | 40 | 20 | 20 | 10 |
| d2[cm] | 30 | 16 | 8 | 4 | 16 | 8 | 4 | 8 | 4 | 4 |
Combination of distance parameters (d1, d2) used for the second-order model. Each distance combination was tested with the following cluster radii (r2): 25, 50 or 75 cm.
