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| Test No. | Test model | Null model | df | 2ΔLb |
| Test 1 | M2A | M1A | 2 | 8.4* |
| Test 2 | M8 | M7 | 2 | 8.0* |
| Test 3 | M8 | M8A | -a | 7.8** |
| Test 4 | Branch-site model A (ω2 estimated) | Branch-site model A (ω2 = 1 fixed) | ||
| Foreground: Heterophylly | 1 | 9.2** | ||
| Foreground: Homophylly | 1 | 0.2 |
The test statistic for the M8A-M8 comparison is compared with 50∶50 mixture of df = 0 and 1 according to Swansson et al. (2003).
*: p<0.05, **: p<0.01.
