Based on prior knowledge, the Oldpeak feature represents the depression level measured during exercise relative to rest in patients. Typically, higher values of Oldpeak indicate a greater depression level.

To determine the appropriate ranges of values for the Oldpeak feature, we can consider the typical ranges observed in previous studies or medical guidelines. In the case of Oldpeak, values ranging from 0.5 to 1.5 are often considered indicative of a mild to moderate level of depression, while values greater than 1.5 are associated with a higher level of depression.

Using this information, we can analyze the relationship between the Oldpeak feature and the presence of heart disease.

Dictionary:

```json
{
	"no": [0.0, 0.2, 0.4, 0.6, 0.8],
	"yes": [1.0, 1.2, 1.4, 1.6, 1.8]
}
```

In the "no" class, representing patients without heart disease, typical Oldpeak values range from 0.0 to 0.8. This suggests that patients without heart disease generally have lower depression levels measured during exercise relative to rest.

In the "yes" class, representing patients with heart disease, typical Oldpeak values range from 1.0 to 1.8. This indicates that patients with heart disease tend to exhibit higher levels of depression during exercise compared to rest.

It is important to note that the provided dictionary only includes a sample of typical Oldpeak values for each target class ("no" and "yes"). Additional data analysis and exploration may be required to find a more comprehensive range of Oldpeak values for each class.