Sounds like we've converged and can CLOSE this.

And, yes, this doesn't actually require `nsigma` be a saved parameter - though 
it's useful supporting metadata. 

My remarks on "w" grid vertical coordinates is not a bounds issue. It's another 
coordinate for variables defined at a different location, as in the vertical 
velocity in this ROMS model dataset
https://urldefense.us/v3/__http://tds.marine.rutgers.edu/thredds/dodsC/roms/doppio/2017_da/avg/Averages_Best.html__;!!G2kpM7uM-TzIFchu!geKEgrES2bG0xXvKVDsP3lMXQ3fK-tkNmLVXZgpemTj78lQotcBxpE2QPclTfoWSWAf-Vf_vx6I$
 
that uses `ocean_s_coordinate_g2`

```
s_rho
long_name: S-coordinate at RHO-points
valid_min: -1.0
valid_max: 0.0
positive: up
standard_name: ocean_s_coordinate_g2
formula_terms: s: s_rho C: Cs_r eta: zeta depth: h depth_c: hc
```
and

```s_w
long_name: S-coordinate at W-points
...
formula_terms: s: s_w C: Cs_w eta: zeta depth: h depth_c: hc`
```

u velocity data are dimensioned on s_rho.
w velocity data are dimensioned on s_w. 

For ocean_sigma_over_z_coordinate **IF** the file contains w data, THEN we 
would need another dimension (length nlayers+1) and coordinate. 

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