diff --git a/src/s1reader/s1_burst_slc.py b/src/s1reader/s1_burst_slc.py
index 90b75e7..a80b2bf 100644
--- a/src/s1reader/s1_burst_slc.py
+++ b/src/s1reader/s1_burst_slc.py
@@ -94,7 +94,7 @@ class represents a polynomial function of range
 
     val, res, _, _ = np.linalg.lstsq(A, z, rcond=cond)
     if len(res) > 0:
-        print("Chi squared: %f" % (np.sqrt(res / (1.0 * len(z)))))
+        print("Chi squared: %f" % np.sqrt(res / (1.0 * len(z))).item())
     else:
         print("No chi squared value....")
         print("Try reducing rank of polynomial.")
@@ -1180,7 +1180,13 @@ def relative_orbit_number(self):
         elif self.platform_id == "S1B":
             orbit_number_offset = 27
         elif self.platform_id == "S1C":
-            orbit_number_offset = 172
+            # 24 June 2026, S1C orbits aligned for 6-days offset with S1D
+            if self.sensing_start < datetime.datetime(2026, 6, 24):
+                orbit_number_offset = 172
+            else:
+                orbit_number_offset = 99
+        elif self.platform_id == "S1D":
+            orbit_number_offset = 42
         else:
             raise ValueError(f"Unknown platform_id: {self.platform_id}")
         return (self.abs_orbit_number - orbit_number_offset) % 175 + 1
diff --git a/src/s1reader/s1_info.py b/src/s1reader/s1_info.py
index ed446e1..162b0ac 100644
--- a/src/s1reader/s1_info.py
+++ b/src/s1reader/s1_info.py
@@ -245,7 +245,7 @@ def main():
             all_files.append(path)
         elif path.is_dir():
             # Get all matching files within the directory
-            files = path.glob("S1[AB]_IW*")
+            files = path.glob("S1[ABCD]_IW*")
             all_files.extend(list(sorted(files)))
         else:
             warnings.warn(f"{path} is not a file or directory. Skipping.")