diff --git a/grasp2alm/beam_cut.py b/grasp2alm/beam_cut.py
index ce5da4b..5f0992b 100644
--- a/grasp2alm/beam_cut.py
+++ b/grasp2alm/beam_cut.py
@@ -115,14 +115,14 @@ def to_polar(self, copol_axis="x"):
         assert copol_axis in ["x", "y"], "Error in BeamCut.to_polar: copol_axis must be 'x' or 'y'"
 
         nphi = int(2 * self.ncut)
-        ntheta = int(self.vnum // 2)
+        ntheta = int(self.vnum // 2)+1
         theta_rad_min = 0.0
         theta_rad_max = np.deg2rad(np.abs(self.vini))
         beam_polar = BeamPolar(nphi, ntheta, theta_rad_min, theta_rad_max, self.filename)
         amp_tmp = np.zeros((2, nphi, ntheta), dtype=complex)
 
         for i in range(self.ncut):
-            amp_tmp[:, i, :] = self.amp[:, ntheta:self.vnum-1, i]
+            amp_tmp[:, i, :] = self.amp[:, ntheta-1:self.vnum+1, i]
             amp_tmp[:, self.ncut + i, :] = self.amp[:, ntheta-1::-1, i]
 
         if copol_axis == "x":