diff --git a/common/src/aaredaqlib/find_xtal.py b/common/src/aaredaqlib/find_xtal.py
index 51c8a6cf..4d366f5f 100644
--- a/common/src/aaredaqlib/find_xtal.py
+++ b/common/src/aaredaqlib/find_xtal.py
@@ -266,7 +266,7 @@ def com_nan_check(com):
 def get_result_list_from_com(images, com: CenterOfMassModel):
     if not com_nan_check(com):
         return None
-    cy, cx = com.n_x, com.n_y
+    cx, cy = com.n_x, com.n_y
     start_x, end_x = round(cx - 1), round(cx + 1)
     start_y, end_y = round(cy - 1), round(cy + 1)
     logger.info(f"range x {start_x} {end_x}, y {start_y} {end_y}")