diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
index d7a5c72..22c8fab 100644
--- a/.devcontainer/devcontainer.json
+++ b/.devcontainer/devcontainer.json
@@ -1,6 +1,6 @@
 {
     "name": "dems",
-    "image":"python:3.12",
+    "image":"python:3.11",
     "onCreateCommand": "pip install poetry==1.6.1",
     "postCreateCommand": "poetry install",
     "containerEnv": {
@@ -18,8 +18,10 @@
             "settings": {
                 "files.insertFinalNewline": true,
                 "files.trimTrailingWhitespace": true,
+                "python.formatting.provider": "black",
                 "python.languageServer": "Pylance",
                 "[python]": {
+                    "editor.formatOnSave": true,
                     "editor.insertSpaces": true,
                     "editor.tabSize": 4
                 }
diff --git a/dems/d2.py b/dems/d2.py
index 0206bba..3dadb08 100644
--- a/dems/d2.py
+++ b/dems/d2.py
@@ -199,6 +199,48 @@ class AsteCabinTemperature:
     units: Attr[str] = "K"
 
 
+@dataclass
+class AsteSubrefX:
+    data: Data[Ti, float]
+    long_name: Attr[str] = "[ASTE] Subreflector offset of X axis"
+    units: Attr[str] = "mm"
+
+
+@dataclass
+class AsteSubrefY:
+    data: Data[Ti, float]
+    long_name: Attr[str] = "[ASTE] Subreflector offset of Y axis"
+    units: Attr[str] = "mm"
+
+
+@dataclass
+class AsteSubrefZ:
+    data: Data[Ti, float]
+    long_name: Attr[str] = "[ASTE] Subreflector offset of Z axis"
+    units: Attr[str] = "mm"
+
+
+@dataclass
+class AsteSubrefXt:
+    data: Data[Ti, float]
+    long_name: Attr[str] = "[ASTE] Subreflector rotation of X axis"
+    units: Attr[str] = "deg"
+
+
+@dataclass
+class AsteSubrefYt:
+    data: Data[Ti, float]
+    long_name: Attr[str] = "[ASTE] Subreflector rotation of Y axis"
+    units: Attr[str] = "deg"
+
+
+@dataclass
+class AsteSubrefZt:
+    data: Data[Ti, float]
+    long_name: Attr[str] = "[ASTE] Subreflector rotation of Z axis"
+    units: Attr[str] = "deg"
+
+
 @dataclass
 class AsteMistiLon:
     data: Data[Ti, float]
@@ -302,6 +344,12 @@ class MS(AsDataArray):
     telescope_coordinates: Attr[Tuple[float, float, float]] = ASTE_ITRS_COORDS
     # ASTE specific
     aste_cabin_temperature: Coordof[AsteCabinTemperature] = 0.0
+    aste_subref_x: Coordof[AsteSubrefX] = 0.0
+    aste_subref_y: Coordof[AsteSubrefY] = 0.0
+    aste_subref_z: Coordof[AsteSubrefZ] = 0.0
+    aste_subref_xt: Coordof[AsteSubrefXt] = 0.0
+    aste_subref_yt: Coordof[AsteSubrefYt] = 0.0
+    aste_subref_zt: Coordof[AsteSubrefZt] = 0.0
     aste_misti_lon: Coordof[AsteMistiLon] = 0.0
     aste_misti_lat: Coordof[AsteMistiLat] = 0.0
     aste_misti_pwv: Coordof[AsteMistiPwv] = 0.0