diff --git a/conda-recipe/meta.yaml b/conda-recipe/meta.yaml
index 2002f58..fed0e3e 100644
--- a/conda-recipe/meta.yaml
+++ b/conda-recipe/meta.yaml
@@ -1,5 +1,5 @@
 {% set name = "tarts" %}
-{% set version = "4.2" %}
+{% set version = "4.3" %}
 {% set python_min = "3.10" %}
 
 package:
diff --git a/python/tarts/focus_offset.yaml b/python/tarts/focus_offset.yaml
index f718758..5225dc3 100644
--- a/python/tarts/focus_offset.yaml
+++ b/python/tarts/focus_offset.yaml
@@ -1,89 +1,92 @@
 z4_peak_pattern:
-  description: "Detector-polarity branch model for Z4 signed error (pred - truth)."
+  description: "Per-band/per-detector Z4 focus corrections from PSF-weighted medians on u/peterma2/tarts_raw_offsets_best300. Applied as Z4 += offset so corrected distributions are centered about zero."
   source:
     by_band_peaks:
-      u: [0.028133]
-      g: [0.013092]
-      r: [-0.04707, 0.048187]
-      i: [-0.12729, 0.13342]
-      z: [-0.36794, 0.37407]
-      y: [-0.9934645787151222, -0.9602425377593652, 0.8337476738515093, 0.8171366533736306]
-    # Peaks keyed by raft half (intra/extra pairs share the same branch: 191/192, 195/196, …).
+      u: [-1.16057932377, -1.15042459965, -1.03539264202, -1.03411114216, -0.304909616709, -0.269676864147, -0.177019536495, -0.152511104941]
+      g: [-0.932408869267, -0.931607365608, -0.621783077717, -0.529829442501, -0.377807885408, -0.362120598555, -0.3154694736, -0.247712776065]
+      r: [-0.849172592163, -0.732081770897, -0.639848053455, -0.585861623287, -0.463141173124, -0.441696047783, -0.430432707071, -0.268543213606]
+      i: [-0.621502220631, -0.592349529266, -0.469701886177, -0.463191926479, -0.418011665344, -0.353004902601, -0.285573452711, -0.209188058972]
+      z: [-0.570211350918, -0.523105680943, -0.505804657936, -0.468138933182, -0.406461596489, -0.0359441414475, -0.0258075613528, 0.0723320841789]
+      y: [-0.949390411377, -0.936058461666, -0.592729449272, -0.578970313072, -0.157845556736, -0.0218827556819, 0.154898881912, 0.243356779218]
+    # Observed PSF-weighted median Z4 [um] per detector in band order u,g,r,i,z,y.
     by_detector_peaks:
-      "191": [0.8337476738515093, 0.37407, 0.13342, 0.043173]
-      "192": [0.8337476738515093, 0.37407, 0.13342, 0.043173]
-      "195": [-0.9934645787151222, -0.37295, -0.12729, -0.042057]
-      "196": [-0.9934645787151222, -0.37295, -0.12729, -0.042057]
-      "199": [-0.9602425377593652, -0.36794, -0.12227, -0.016989]
-      "200": [-0.9602425377593652, -0.36794, -0.12227, -0.016989]
-      "203": [0.8171366533736306, 0.36905, 0.1284, 0.048187]
-      "204": [0.8171366533736306, 0.36905, 0.1284, 0.048187]
+      "191": [-1.03411114216, -0.529829442501, -0.639848053455, -0.621502220631, -0.468138933182, -0.592729449272]
+      "192": [-0.269676864147, -0.377807885408, -0.441696047783, -0.463191926479, -0.505804657936, -0.936058461666]
+      "195": [-1.03539264202, -0.621783077717, -0.849172592163, -0.353004902601, -0.0258075613528, 0.243356779218]
+      "196": [-0.152511104941, -0.247712776065, -0.268543213606, -0.209188058972, 0.0723320841789, -0.0218827556819]
+      "199": [-1.15042459965, -0.932408869267, -0.585861623287, -0.418011665344, -0.406461596489, 0.154898881912]
+      "200": [-0.304909616709, -0.362120598555, -0.430432707071, -0.285573452711, -0.0359441414475, -0.157845556736]
+      "203": [-1.16057932377, -0.931607365608, -0.732081770897, -0.592349529266, -0.570211350918, -0.578970313072]
+      "204": [-0.177019536495, -0.3154694736, -0.463141173124, -0.469701886177, -0.523105680943, -0.949390411377]
+    median_collection: "u/peterma2/tarts_raw_offsets_best300"
+    derived_from: "target_offsets_z4_medians.yaml weighted_median_z4; offset = -median"
 
   detector_polarity_groups:
     positive_branch: [191, 192, 203, 204]
     negative_branch: [195, 196, 199, 200]
 
   branch_amplitude_by_band:
-    u: 0.028133
-    g: 0.013092
-    r: 0.048187
-    i: 0.13342
-    z: 0.37407
-    y: 0.8969951058054373
+    u: 0.660578103736
+    g: 0.53984243609
+    r: 0.551347147673
+    i: 0.426565455273
+    z: 0.325975750806
+    y: 0.454391576117
 
-  # Applied in NeuralActiveOpticsSys: same offset for intra/extra chip of each half (191↔192, etc.).
+  # Applied in NeuralActiveOpticsSys as Z4 += offset (index 0).
+  # offset = -weighted_median so corrected Z4 is centered near zero.
   branch_prediction_by_band_detector:
     u:
-      "191": 0.028133
-      "192": 0.028133
-      "195": -0.028133
-      "196": -0.028133
-      "199": -0.028133
-      "200": -0.028133
-      "203": 0.028133
-      "204": 0.028133
+      "191": 1.03411114216
+      "192": 0.269676864147
+      "195": 1.03539264202
+      "196": 0.152511104941
+      "199": 1.15042459965
+      "200": 0.304909616709
+      "203": 1.16057932377
+      "204": 0.177019536495
     g:
-      "191": 0.013092
-      "192": 0.013092
-      "195": -0.013092
-      "196": -0.013092
-      "199": -0.013092
-      "200": -0.013092
-      "203": 0.013092
-      "204": 0.013092
+      "191": 0.529829442501
+      "192": 0.377807885408
+      "195": 0.621783077717
+      "196": 0.247712776065
+      "199": 0.932408869267
+      "200": 0.362120598555
+      "203": 0.931607365608
+      "204": 0.3154694736
     r:
-      "191": 0.048187
-      "192": 0.048187
-      "195": -0.048187
-      "196": -0.048187
-      "199": -0.048187
-      "200": -0.048187
-      "203": 0.048187
-      "204": 0.048187
+      "191": 0.639848053455
+      "192": 0.441696047783
+      "195": 0.849172592163
+      "196": 0.268543213606
+      "199": 0.585861623287
+      "200": 0.430432707071
+      "203": 0.732081770897
+      "204": 0.463141173124
     i:
-      "191": 0.13342
-      "192": 0.13342
-      "195": -0.13342
-      "196": -0.13342
-      "199": -0.13342
-      "200": -0.13342
-      "203": 0.13342
-      "204": 0.13342
+      "191": 0.621502220631
+      "192": 0.463191926479
+      "195": 0.353004902601
+      "196": 0.209188058972
+      "199": 0.418011665344
+      "200": 0.285573452711
+      "203": 0.592349529266
+      "204": 0.469701886177
     z:
-      "191": 0.37407
-      "192": 0.37407
-      "195": -0.37407
-      "196": -0.37407
-      "199": -0.37407
-      "200": -0.37407
-      "203": 0.37407
-      "204": 0.37407
+      "191": 0.468138933182
+      "192": 0.505804657936
+      "195": 0.0258075613528
+      "196": -0.0723320841789
+      "199": 0.406461596489
+      "200": 0.0359441414475
+      "203": 0.570211350918
+      "204": 0.523105680943
     y:
-      "191": 0.8337476738515093
-      "192": 0.8337476738515093
-      "195": -0.9934645787151222
-      "196": -0.9934645787151222
-      "199": -0.9602425377593652
-      "200": -0.9602425377593652
-      "203": 0.8171366533736306
-      "204": 0.8171366533736306
+      "191": 0.592729449272
+      "192": 0.936058461666
+      "195": -0.243356779218
+      "196": 0.0218827556819
+      "199": -0.154898881912
+      "200": 0.157845556736
+      "203": 0.578970313072
+      "204": 0.949390411377
diff --git a/python/tarts/intrinsics_corners.parquet b/python/tarts/intrinsics_corners.parquet
deleted file mode 100644
index 333c8b9..0000000
Binary files a/python/tarts/intrinsics_corners.parquet and /dev/null differ
diff --git a/setup.py b/setup.py
index f247bf3..2534d08 100644
--- a/setup.py
+++ b/setup.py
@@ -10,7 +10,7 @@
 
 setup(
     name="tarts",
-    version="4.2",
+    version="4.3",
     packages=find_packages(),
     install_requires=[],
     author="Peter Xiangyuan Ma",