```env_btc_ccxt.py```: Request for clarification on ```day_tech``` feature mapping and normalization

As stated in your ```env_btc_ccxt.py```:
```
normalized_tech = [
    self.day_tech[0] * 2**-1,
    self.day_tech[1] * 2**-15,
    self.day_tech[2] * 2**-15,
    self.day_tech[3] * 2**-6,
    self.day_tech[4] * 2**-6,
    self.day_tech[5] * 2**-15,
    self.day_tech[6] * 2**-15,
]
```
What is the feature of day_tech