This private method is called only by another private method (`_det_typeC_grid_coord`).  That private method defines the context for this method:
```Python
         # Define the T, U, and V grid coordinates. The theta values are
         # stored in the first element of the second dimension on the
         # coordinates can be found on the second element of the second
         # dimension.
```
I could add `# Define horizontal grid components` if you really want?