add comments here to make it (very) clear that it's (about) 63GB: 

```python
'delcatty' : {
    'PHYSMEM' : 66045320 << 10,  # ~63GB
    'TOTMEM' : 87016832 << 10,  # ~83GB
    'NP': 16,
}
```

also: 4-space indentation, `,` after each entry