Based on prior knowledge, the ST_Slope feature can be related to the presence or absence of heart disease detected through coronary angiography. Here's the analysis and the corresponding dictionary:

Analysis:
- Up Slope: Typically, an upward slope of the peak exercise ST segment indicates a low probability of heart disease.
- Flat Slope: A flat slope of the peak exercise ST segment can be associated with coronary artery disease, and it may require additional investigation.
- Down Slope: A downward slope of the peak exercise ST segment is often found in patients with probable heart disease.

Dictionary:
```json
{
	"no": ["Up"],
	"yes": ["Flat", "Down"]
}
```

Please note that the dictionary includes the possible values "Up" for the "no" class, indicating that an upward slope is generally associated with no heart disease. In contrast, it includes the possible values "Flat" and "Down" for the "yes" class as these slopes are commonly observed in patients with heart disease.