diff --git a/requirements/test.pip b/requirements/test.pip
index c851921..4e75cf2 100644
--- a/requirements/test.pip
+++ b/requirements/test.pip
@@ -9,4 +9,5 @@ pytest-xdist>=3.0.2
 
 # Pin versions for tests
 matplotlib==3.6.*
+pynrrd==1.0.0
 seaborn==0.12.*
diff --git a/tests/data/in_small_O1/out/synthesis/apical_points.yaml b/tests/data/in_small_O1/out/synthesis/apical_points.yaml
index de5bbc7..f827e5f 100644
--- a/tests/data/in_small_O1/out/synthesis/apical_points.yaml
+++ b/tests/data/in_small_O1/out/synthesis/apical_points.yaml
@@ -2,49 +2,49 @@
 216363698b529b4a97b750923ceb3ffd: null
 4462ebfc5f915ef09cfbac6e7687a66e: null
 48f165d57b00c7f4781ef86f5c8cc1ab:
-- -14.394819259643555
-- 194.89781188964844
-- 9.01955795288086
+- -14.394821166992188
+- 194.8978271484375
+- 9.019556999206543
 4dad2986ce8349606a06e9ab85a0bcc1:
-- -1.07305908203125
+- -1.0730547904968262
 - 195.03805541992188
-- -7.569953918457031
+- -7.569961071014404
 5bc8fbbcbde5c0994164d8399f767c45: null
 6018366cf658f7a75ed34fe53a096533: null
 6513270e269e0d37f2a74de452e6b438: null
 72e63ac7a95383221f70d5dc2e675fc7:
-- 4.626476764678955
-- 194.84230041503906
-- 20.284626007080078
+- 4.6264824867248535
+- 194.84231567382812
+- 20.28464126586914
 7b89296c6dcbac5008577eb1924770d3:
-- -8.819189071655273
-- 194.1275177001953
-- -14.387084007263184
+- -8.819184303283691
+- 194.12750244140625
+- -14.38708782196045
 8575062102fbcd4f357fbc5af71a1bfc:
-- -1.843111515045166
+- -1.8431235551834106
 - 195.61419677734375
-- 12.465193748474121
+- 12.46518611907959
 87751d4ca8501e2c44dcda6a797d76de:
-- -3.984039545059204
+- -3.9840335845947266
 - 197.0111541748047
-- -6.497995376586914
+- -6.498000144958496
 b8a1abcd1a6916c74da4f9fc3c6da5d7: null
 c15521b1b3dca50a9daa37e51b591d75:
-- -0.25705447793006897
-- 199.17787170410156
-- 11.141695022583008
+- -0.2570788562297821
+- 199.17788696289062
+- 11.141693115234375
 cd613e30d8f16adf91b7584a2265b1f5: null
 d95bafc8f2a4d27bdcf4bb99f4bea973: null
 db5b5fab8f4d3e27dda1494c73cf256d:
 - 26.932884216308594
-- 195.74429321289062
-- -1.293025255203247
+- 195.74427795410156
+- -1.2930362224578857
 e3e70682c2094cac629f6fbed82c07cd: null
 e539a78bc8eff3460b12ae6ead581e57:
-- 9.035844802856445
-- 195.72015380859375
-- 7.5418572425842285
+- 9.035848617553711
+- 195.7201690673828
+- 7.5418620109558105
 e8d79f49af6d114c4a6f188a424e617b:
-- 21.528072357177734
+- 21.5280704498291
 - 197.24026489257812
-- 9.389350891113281
+- 9.38935661315918