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Data for port size studied for measuring milk color.
| Aperture Size | Number of Articles (%) |
|---|---|
| Not reported | 563 (93.8%) |
| 8 mm | 18 (3.0%) |
| 45 mm | 5 (0.8%) |
| More than 50 mm | 5 (0.8%) |
| 10–25 mm | 4 (0.7%) |
| 30–35 mm | 2 (0.3%) |
| 50 mm | 2 (0.3%) |
| 4 mm or less | 1 (0.2%) |
