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Mean number of explorers during the different test conditions.
| Condition | Substrate | Mean number of explorers±SE | Size effect compared to condition “no substrate, downward angle” |
|---|---|---|---|
| “no substrate, downward angle” | before | 23.75 ± 2.25 | 0.00 |
| “no substrate, upward angle” | before | 6.33 ± 1.67 | 4.42 |
| “post substrate, upward angle” | after | 27.50 ± 5.5 | 0.68 |
| “substrate, upward angle” | present | 32.00 ± 9.00 | 1.10 |
