diff --git a/nnpdf_data/nnpdf_data/commondata/ATLAS_Z0_7TEV_LOMASS/filter_utils.py b/nnpdf_data/nnpdf_data/commondata/ATLAS_Z0_7TEV_LOMASS/filter_utils.py
index 6b662669bf..ef0d2a2205 100644
--- a/nnpdf_data/nnpdf_data/commondata/ATLAS_Z0_7TEV_LOMASS/filter_utils.py
+++ b/nnpdf_data/nnpdf_data/commondata/ATLAS_Z0_7TEV_LOMASS/filter_utils.py
@@ -19,17 +19,10 @@ def get_kinematics():
     with open(hepdata_table, 'r') as file:
         input = yaml.safe_load(file)
 
-    y_values = [12.41, 22.57, 14.64, 6.73, 2.81, 1.27]
-
     for i, M in enumerate(input["independent_variables"][0]['values']):
 
         kin_value = {
-            'y': {'min': None, 'mid': y_values[i], 'max': None},
-            'M2': {
-                'min': M['low'] ** 2,
-                'mid': (0.5 * (M['low'] + M['high'])) ** 2,
-                'max': M['high'] ** 2,
-            },
+            'm_ll': {'min': M['low'], 'mid': (0.5 * (M['low'] + M['high'])), 'max': M['high']},
             'sqrts': {'min': None, 'mid': 7000.0, 'max': None},
         }
 
diff --git a/nnpdf_data/nnpdf_data/commondata/ATLAS_Z0_7TEV_LOMASS/kinematics.yaml b/nnpdf_data/nnpdf_data/commondata/ATLAS_Z0_7TEV_LOMASS/kinematics.yaml
index 54cd594664..6fbaee161f 100644
--- a/nnpdf_data/nnpdf_data/commondata/ATLAS_Z0_7TEV_LOMASS/kinematics.yaml
+++ b/nnpdf_data/nnpdf_data/commondata/ATLAS_Z0_7TEV_LOMASS/kinematics.yaml
@@ -1,72 +1,48 @@
 bins:
-- y:
-    min: null
-    mid: 12.41
-    max: null
-  M2:
-    min: 144.0
-    mid: 210.25
-    max: 289.0
+- m_ll:
+    min: 12.0
+    mid: 14.5
+    max: 17.0
   sqrts:
     min: null
     mid: 7000.0
     max: null
-- y:
-    min: null
-    mid: 22.57
-    max: null
-  M2:
-    min: 289.0
-    mid: 380.25
-    max: 484.0
+- m_ll:
+    min: 17.0
+    mid: 19.5
+    max: 22.0
   sqrts:
     min: null
     mid: 7000.0
     max: null
-- y:
-    min: null
-    mid: 14.64
-    max: null
-  M2:
-    min: 484.0
-    mid: 625.0
-    max: 784.0
+- m_ll:
+    min: 22.0
+    mid: 25.0
+    max: 28.0
   sqrts:
     min: null
     mid: 7000.0
     max: null
-- y:
-    min: null
-    mid: 6.73
-    max: null
-  M2:
-    min: 784.0
-    mid: 1024.0
-    max: 1296.0
+- m_ll:
+    min: 28.0
+    mid: 32.0
+    max: 36.0
   sqrts:
     min: null
     mid: 7000.0
     max: null
-- y:
-    min: null
-    mid: 2.81
-    max: null
-  M2:
-    min: 1296.0
-    mid: 1681.0
-    max: 2116.0
+- m_ll:
+    min: 36.0
+    mid: 41.0
+    max: 46.0
   sqrts:
     min: null
     mid: 7000.0
     max: null
-- y:
-    min: null
-    mid: 1.27
-    max: null
-  M2:
-    min: 2116.0
-    mid: 3136.0
-    max: 4356.0
+- m_ll:
+    min: 46.0
+    mid: 56.0
+    max: 66.0
   sqrts:
     min: null
     mid: 7000.0
diff --git a/nnpdf_data/nnpdf_data/commondata/ATLAS_Z0_7TEV_LOMASS/metadata.yaml b/nnpdf_data/nnpdf_data/commondata/ATLAS_Z0_7TEV_LOMASS/metadata.yaml
index 6339f96375..70b4df21d7 100644
--- a/nnpdf_data/nnpdf_data/commondata/ATLAS_Z0_7TEV_LOMASS/metadata.yaml
+++ b/nnpdf_data/nnpdf_data/commondata/ATLAS_Z0_7TEV_LOMASS/metadata.yaml
@@ -1,6 +1,6 @@
 setname: ATLAS_Z0_7TEV_LOMASS
 version: 1
-version_comment: Port of old commondata
+version_comment: "First implementation"
 nnpdf_metadata:
   nnpdf31_process: DY NC
   experiment: ATLAS
@@ -18,34 +18,29 @@ implemented_observables:
     description: Drell-Yan Mass Distribution
     label: ATLAS low-mass DY 2011
     units: ''
-  process_type: EWK_MLL
+  process_type: DY_MLL
   tables: [6]
-  npoints: []
+  npoints: [6]
   ndata: 6
   plotting:
-    kinematics_override: ewk_mll_sqrt_scale
+    kinematics_override: identity
     dataset_label: ATLAS low-mass DY 2011
     y_label: $d\sigma_{Z/\gamma^{*}}/dM_{ll}$ (fb)
-    plot_x: k2
+    plot_x: m_ll
   kinematic_coverage:
-  - k1
-  - k2
-  - k3
+  - m_ll
+  - sqrts
   kinematics:
     variables:
-      k1:
-        description: Variable k1
-        label: k1
-        units: ''
-      k2:
-        description: Variable k2
-        label: k2
-        units: ''
-      k3:
-        description: Variable k3
-        label: k3
-        units: ''
-    file: kinematics_M.yaml
+      m_ll:
+        description: squared mass
+        label: m_ll
+        units: 'GeV'
+      sqrts:
+        description: center of mass energy
+        label: sqrts
+        units: 'GeV'
+    file: kinematics.yaml
   theory:
     conversion_factor: 1000.0
     operation: 'null'