```json
{
	"low": [0.5, 0.6, 0.7, 0.8, 0.9],
	"high": [1.2, 1.3, 1.4, 1.5, 1.6]
}
```
Based on prior knowledge, the number of grains per pod (NS) is likely to have a positive correlation with grain yield of the soybean cultivar. A higher NS value means that there are more grains per pod, which generally results in higher grain yield. Therefore, we can expect that a higher NS value will be associated with a high grain yield and a lower NS value with a low grain yield.

For the "low" target class, typical NS values could range from 0.5 to 0.9. These values indicate a lower number of grains per pod, which may result in a lower grain yield.

For the "high" target class, typical NS values could range from 1.2 to 1.6. These values indicate a higher number of grains per pod, which may result in a higher grain yield.