diff --git a/src/science_signal/signal.py b/src/science_signal/signal.py
index e0d2953..d6500d0 100644
--- a/src/science_signal/signal.py
+++ b/src/science_signal/signal.py
@@ -74,7 +74,7 @@ class Signal:
             start = min(self.x)
         if end is None:
             end = max(self.x)
-        indexes = where(logical_and(self.x > start, self.x < end))
+        indexes = where(logical_and(self.x >= start, self.x <= end))
         return Signal(
             self.x[indexes],
             self.y[indexes],
@@ -120,7 +120,7 @@ class Signal:
             end = max(abs(freq_x))
 
         index_to_remove = where(
-            logical_and(abs(freq_x) < start, abs(freq_x) > end)
+            logical_and(abs(freq_x) <= start, abs(freq_x) >= end)
         )
         freq_y[index_to_remove] = 0
         y = irfft(freq_y)