To analyze the relationship between the NLP (Number of stems) feature and the grain yield of the soybean cultivar, we can make some assumptions based on prior knowledge. Generally, a higher number of stems is associated with higher grain yield, as more stems usually lead to more pods and subsequently more grains. 

Since there is no specific information provided regarding the ranges of values for the NLP feature, we can consider the following typical ranges:

- Low NLP: 10-15 stems
- High NLP: 25-30 stems

Based on these assumptions, we can create a dictionary with typical NLP values for each target class:

```json
{
	"low": [10.0, 11.0, 12.0, 13.0, 14.0],
	"high": [25.0, 26.0, 27.0, 28.0, 29.0]
}
```

Note that these are just example values and the actual ranges may vary depending on the specific characteristics of the soybean cultivar.