diff --git a/modules/util/acspo_validate.py b/modules/util/acspo_validate.py
index 10a11ce6d6b59b61a80e58ac630d5753acf67ba1..1e119ded5e28c36a5fdc6599e37762f540ab3e96 100644
--- a/modules/util/acspo_validate.py
+++ b/modules/util/acspo_validate.py
@@ -33,7 +33,24 @@ def acspo_validate(oper_file, cspp_file):
 
     idxs_lat = np.isin(cntr_lat_oper, cntr_lat_cspp, assume_unique=True)
     idxs_lon = np.isin(cntr_lon_oper, cntr_lon_cspp, assume_unique=True)
-    print(np.sum(idxs_lon), np.sum(idxs_lat))
+
+    start_idx_oper = -1
+    stop_idx_oper = -1
+    start_idx_cspp = -1
+    stop_idx_cspp = -1
+
+    for k in range(len(cntr_lat_oper)):
+        c_a = np.isclose(cntr_lat_oper[k], cntr_lat_cspp)
+        if np.size(np.nonzero(c_a)[0]) == 1:
+            if start_idx_oper == -1:
+                start_idx_oper = k
+                start_idx_cspp = np.nonzero(c_a)[0][0]
+            else:
+                stop_idx_oper = k
+                stop_idx_cspp = np.nonzero(c_a)[0][0]
+
+    print(start_idx_oper, stop_idx_oper)
+    print(start_idx_cspp, stop_idx_cspp)