```json
{
	"no": [0.0, 0.5, 1.0, 1.5, 2.0],
	"yes": [1.0, 1.5, 2.0, 2.5, 3.0]
}
```
Based on prior knowledge, the feature Oldpeak represents the ST depression induced by exercise relative to rest. ST depression is measured in millimeters and is an important marker for diagnosing heart disease.

Analyzing the relationship between Oldpeak and the target variable (coronary angiography showing heart disease), we can make the following observations:

1. For patients without heart disease (target class "no"), typical Oldpeak values range from 0.0 to 2.0, with increments of 0.5. This suggests that patients without heart disease generally have lower Oldpeak values.
2. For patients with heart disease (target class "yes"), typical Oldpeak values range from 1.0 to 3.0, with increments of 0.5. This indicates that patients with heart disease tend to have higher Oldpeak values.

These representative Oldpeak values provide a glimpse into the relationship between the feature and the target class. Please note that this analysis is based on general observations and may vary depending on the specific dataset and context.