```json
{
	"low": [2.0, 2.5, 3.0, 3.5, 4.0],
	"high": [4.5, 5.0, 5.5, 6.0, 6.5]
}
```
Based on prior knowledge, a low number of legumes per plant (NGP) for a soybean cultivar could be in the range of 2.0 to 4.0, while a high number of legumes per plant could be in the range of 4.5 to 6.5. The provided dictionary includes 5 typical NGP values for each target class.