diff --git a/mbtrack2/tracking/particles.py b/mbtrack2/tracking/particles.py
index 74ef09cbd4c58a50892d9316cc98a34bf6ebba34..e3c6f2e0f892b48400d520f28c8675282139308e 100644
--- a/mbtrack2/tracking/particles.py
+++ b/mbtrack2/tracking/particles.py
@@ -282,7 +282,6 @@ class Bunch:
         """
         Return the bunch emittance for each plane.
         """
-        cor = np.squeeze([[self[name] - self[name].mean()] for name in self])
 
         cov_x = np.cov(self['x'], self['xp'])
         cov_y = np.cov(self['y'], self['yp'])