diff --git a/src/synth_mapping_helper/__init__.py b/src/synth_mapping_helper/__init__.py
index bdaee0e..883ea68 100644
--- a/src/synth_mapping_helper/__init__.py
+++ b/src/synth_mapping_helper/__init__.py
@@ -1,4 +1,4 @@
-__version__ = "0.9.0"
+__version__ = "0.9.1"
 
 from . import movement 
 from . import pattern_generation
diff --git a/src/synth_mapping_helper/rails.py b/src/synth_mapping_helper/rails.py
index ea83f7a..ec36ee9 100644
--- a/src/synth_mapping_helper/rails.py
+++ b/src/synth_mapping_helper/rails.py
@@ -21,7 +21,7 @@ def interpolate_spline(data: "numpy array (n, m)", new_z: "numpy array (x)") ->
         pchip_interpolate(padded_data[:, 2], padded_data[:, 0], new_z),
         pchip_interpolate(padded_data[:, 2], padded_data[:, 1], new_z),
         new_z,
-    ), axis=-1)[1:-1]
+    ), axis=-1)
 
 def get_position_at(notes: SINGLE_COLOR_NOTES, beat: float, interpolate_gaps: bool = True) -> "numpy array (2)":
     # single note