diff --git a/src/aarecommon/models/beam_centre.py b/src/aarecommon/models/beam_centre.py
index 5518a88..e47b8e7 100644
--- a/src/aarecommon/models/beam_centre.py
+++ b/src/aarecommon/models/beam_centre.py
@@ -23,22 +23,21 @@ class BeamCentreMeasurements(BaseModel):
 
 
 class BeamCentre(BaseModel):
-    measurements: BeamCentreMeasurements
+    measured: BeamCentreMeasurements
     model: BeamCenterFromDetectorStage
 
     @model_validator(mode="before")
     @classmethod
     def _generate_model(cls, data: Any) -> Any:
-        if not isinstance(data, dict) or "model" in data or "measurements" not in data:
+        if not isinstance(data, dict) or "model" in data or "measured" not in data:
             return data
-        measurements = BeamCentreMeasurements.model_validate(data["measurements"])
+        measured = BeamCentreMeasurements.model_validate(data["measured"])
         return {
-            **data,
-            "measurements": measurements,
+            "measured": measured,
             "model": fit_beam_centre_model(
-                det_z_mm=measurements.det_z_mm,
-                det_y_mm=measurements.det_y_mm,
-                beam_x_px=measurements.beam_x_px,
-                beam_y_px=measurements.beam_y_px,
+                det_z_mm=measured.det_z_mm,
+                det_y_mm=measured.det_y_mm,
+                beam_x_px=measured.beam_x_px,
+                beam_y_px=measured.beam_y_px,
             ),
         }
diff --git a/tests/test_beam_centre.py b/tests/test_beam_centre.py
index b504ce8..537fbc5 100644
--- a/tests/test_beam_centre.py
+++ b/tests/test_beam_centre.py
@@ -258,7 +258,7 @@ def test_beam_centre_fits_model_from_measurements(stage_grid):
     beam_x_px, beam_y_px = synth(det_z_mm, det_y_mm)
     beam_centre = BeamCentre.model_validate(
         {
-            "measurements": {
+            "measured": {
                 "det_z_mm": det_z_mm.tolist(),
                 "det_y_mm": det_y_mm.tolist(),
                 "beam_x_px": beam_x_px.tolist(),
@@ -276,7 +276,7 @@ def test_beam_centre_keeps_an_explicitly_supplied_model(synthetic_fit, stage_gri
     beam_x_px, beam_y_px = synth(det_z_mm, det_y_mm)
     beam_centre = BeamCentre.model_validate(
         {
-            "measurements": {
+            "measured": {
                 "det_z_mm": det_z_mm.tolist(),
                 "det_y_mm": det_y_mm.tolist(),
                 "beam_x_px": (beam_x_px + 1000.0).tolist(),
@@ -293,7 +293,7 @@ def test_beam_centre_revalidation_is_idempotent(stage_grid):
     beam_x_px, beam_y_px = synth(det_z_mm, det_y_mm)
     beam_centre = BeamCentre.model_validate(
         {
-            "measurements": {
+            "measured": {
                 "det_z_mm": det_z_mm.tolist(),
                 "det_y_mm": det_y_mm.tolist(),
                 "beam_x_px": beam_x_px.tolist(),
@@ -309,7 +309,7 @@ def test_beam_centre_propagates_fit_errors():
     with pytest.raises(ValueError, match="same length"):
         BeamCentre.model_validate(
             {
-                "measurements": {
+                "measured": {
                     "det_z_mm": [170.0, 250.0, 320.0],
                     "det_y_mm": [62.0, 62.0, 62.0],
                     "beam_x_px": [2090.0, 2095.0],