diff --git a/dials_data/definitions/thaumatin_i03_grid_scans.yml b/dials_data/definitions/thaumatin_i03_grid_scans.yml
new file mode 100644
index 00000000..2ae402b4
--- /dev/null
+++ b/dials_data/definitions/thaumatin_i03_grid_scans.yml
@@ -0,0 +1,17 @@
+name: Thaumatin Eiger2 XE 16M orthogonal grid scans from Diamond Light Source I03
+author: Beilsten-Edmands, James (2025)
+license: CC-BY 4.0
+url: https://zenodo.org/records/16928315
+description: >
+  Two xray centering grid scans taken across a single thaumatin
+  crystal during commissioning in June 2025. The two grid scans are
+  related by 90 degrees of rotation. Each grid scan has a separate 
+  .nxs file, however the raw data for both scans are contained within
+  thau_3_113_000001.h5 and thau_3_113_000002.h5.
+
+data:
+ - url: https://zenodo.org/records/16928315/files/thau_3_113.nxs
+ - url: https://zenodo.org/records/16928315/files/thau_3_113_000001.h5
+ - url: https://zenodo.org/records/16928315/files/thau_3_113_000002.h5
+ - url: https://zenodo.org/records/16928315/files/thau_3_113_meta.h5
+ - url: https://zenodo.org/records/16928315/files/thau_3_114.nxs
\ No newline at end of file
diff --git a/dials_data/definitions/thaumatin_i03_rotation.yml b/dials_data/definitions/thaumatin_i03_rotation.yml
new file mode 100644
index 00000000..882da8e8
--- /dev/null
+++ b/dials_data/definitions/thaumatin_i03_rotation.yml
@@ -0,0 +1,14 @@
+name: Thaumatin Eiger2 XE 16M rotation dataset from Diamond Light Source I03
+author: Beilsten-Edmands, James (2025)
+license: CC-BY 4.0
+url: https://zenodo.org/records/16928315
+description: >
+  100 images of 0.1 degree oscillation, collected on a thaumatin
+  crystal during commissioning in June 2025. This is a subset of a
+  3600 image dataset, for the purpose of testing live-feedback data
+  analysis routines.
+
+data:
+ - url: https://zenodo.org/records/16928315/files/thau_2_1.nxs
+ - url: https://zenodo.org/records/16928315/files/thau_2_1_000001.h5
+ - url: https://zenodo.org/records/16928315/files/thau_2_1_meta.h5
\ No newline at end of file