Based on prior knowledge, the feature Oldpeak represents the amount of depression of the ST segment in the electrocardiogram (ECG) wave. A higher value of Oldpeak indicates a greater degree of depression. 

To determine the appropriate ranges of values for Oldpeak, we can refer to medical literature and guidelines. The American Heart Association suggests that an Oldpeak value of 0.1 to 1.0 is considered mildly abnormal, while a value above 1.0 is more concerning and indicates a higher likelihood of heart disease. 

Now, let's analyze the relationship between Oldpeak and the task of determining whether the coronary angiography shows heart disease.

Dictionary:

```json
{
	"no": [0.1, 0.5, 0.8, 1.2, 1.6],
	"yes": [1.5, 2.0, 2.5, 3.0, 4.0]
}
```

Explanation:
- For the target class "no" (no heart disease), some possible Oldpeak values include 0.1, 0.5, 0.8, 1.2, and 1.6.
- For the target class "yes" (heart disease present), typical Oldpeak values could be 1.5, 2.0, 2.5, 3.0, and 4.0.

Please note that these values are for illustrative purposes and may vary depending on the specific dataset and domain knowledge. It is recommended to consult with medical experts and consider the context of the dataset to obtain more precise and accurate ranges for Oldpeak.