Options for overwriting the water in the hybrid model

When thinking about overwriting water fields from Snr to Jnr, the obvious options are

  1. Overwrite all water fields: vapour, rain and cloud liquid and ice.
  2. Overwrite just the cloud fields: cloud liquid and ice.
  3. Overwrite vapour and rain (and not cloud fields).
  4. Don't overwrite any of them.