diff --git a/Project.toml b/Project.toml
index d1e58cf..78c5f25 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "TwoLayerDirectNumericalShenanigans"
 uuid = "40aaee9f-3595-48be-b36c-f1067009652f"
 authors = ["Josef Bisits <jbisits@gmail.com>"]
-version = "0.6.2"
+version = "0.6.3"
 
 [deps]
 CUDA = "052768ef-5323-5732-b1bb-66c8b64840ba"
diff --git a/src/constants.jl b/src/constants.jl
index 0d73d6f..2b7a15f 100644
--- a/src/constants.jl
+++ b/src/constants.jl
@@ -1,8 +1,8 @@
 """
     const DOMAIN_EXTENT
-Domain extent on which the two layer simulations are run.
+Domain extent on which my two layer simulations are run.
 """
-const DOMAIN_EXTENT = (Lx = 0.1, Ly = 0.1, Lz = 1)
+const DOMAIN_EXTENT = (Lx = 0.1, Ly = 0.1, Lz = -1)
 """
     const HIGH_RESOLUTION
 Resolution at which to run the DNS sufficient to resolve turbulence on all scales, i.e.
@@ -15,17 +15,25 @@ const HIGH_RESOLUTION = (Nx = 124, Ny = 124, Nz = 1400)
 Diffusivity estimates for the Southern Ocean.
 """
 const SO_DIFFUSIVITIES = (ν = 1e-6, κ = (S = 1e-9, T = 1e-7))
+"""
+    const EQUAL_ST_DIFFUSIVITIES
+Equal salinity and temperature diffusivities. The salinity diffusivity is increased to match
+temperature diffusivity. The viscosity and temperature diffusivities are still close to
+physical values.
+"""
+const EQUAL_ST_DIFFUSIVITIES = (ν = 1e-6, κ = (S = 1e-7, T = 1e-7))
 """
     const REFERENCE_DENSITY
 Reference density for use in the two layer DNS. Calculated using the salinity `S₀ˡ` and
 temperature `T₀ˡ` of the lower layer .
 """
-const REFERENCE_DENSITY = gsw_rho(34.7, -1.5, 0)
+const REFERENCE_DENSITY = gsw_rho(34.7, 0.5, 0)
 """
     const INTERFACE_LOCATION
-Location of the interface (in the vertical) between the upper and lower layers.
+Location of the interface (in the vertical) between the upper and lower layers. This
+default setting is in the middle of the [`DOMAIN_EXTENT`](@ref).
 """
-const INTERFACE_LOCATION = -0.375
+const INTERFACE_LOCATION = -0.5
 """
     const SIMULATION_PATH
 Path to where the simulations are saved by default. If the folder does not exist it will be
diff --git a/src/twolayerdns.jl b/src/twolayerdns.jl
index ededa11..ec7ef26 100644
--- a/src/twolayerdns.jl
+++ b/src/twolayerdns.jl
@@ -70,7 +70,7 @@ function DNSModel(architecture, domain_extent::NamedTuple, resolution::NamedTupl
 
     Lx, Ly, Lz = domain_extent.Lx, domain_extent.Ly, domain_extent.Lz
     Nx, Ny, Nz = resolution.Nx, resolution.Ny, resolution.Nz
-    zgrid = zgrid_stretching ? grid_stretching(Lz, Nz, refinement, stretching) : (-Lz, 0)
+    zgrid = zgrid_stretching ? grid_stretching(-Lz, Nz, refinement, stretching) : (Lz, 0)
 
     grid = RectilinearGrid(architecture,
                            topology = (Periodic, Periodic, Bounded),