diff --git a/CAL/CalibrationCommon/lib/datacontainers/calibration_table.py b/CAL/CalibrationCommon/lib/datacontainers/calibration_table.py
index f0c2419c943910db7e003361969e3fb3382b82d5..de991e9155d9faf3bb6da49226da1f73d8f184dd 100644
--- a/CAL/CalibrationCommon/lib/datacontainers/calibration_table.py
+++ b/CAL/CalibrationCommon/lib/datacontainers/calibration_table.py
@@ -9,7 +9,7 @@ from typing import List
 
 from dataclasses import dataclass, asdict, field
 from h5py import File
-from numpy import empty as empty_ndarray, ndarray, fromiter as array_from_iter, float64,\
+from numpy import empty as empty_ndarray, ndarray, fromiter as array_from_iter, float64, \
     array_equal, arange, array
 from copy import deepcopy
 
@@ -61,6 +61,7 @@ class CalibrationTable:
 
     observation_antennaset: str = ''
     observation_band: str = ''
+
     @staticmethod
     def load_from_file(file_path):
         logger.info('loading file %s', file_path)
@@ -177,6 +178,16 @@ class CalibrationTable:
             raise InvalidFileException('empty header')
         return header
 
+    def _parse_header(self):
+        self.observation_mode = int(self.observation_mode)
+        self.calibration_version = int(self.calibration_version)
+        if isinstance(self.calibration_ppsdelay, str):
+            self.calibration_ppsdelay = list(map(int, self.calibration_ppsdelay.
+                                                 lstrip('[').
+                                                 rstrip(']').
+                                                 strip().
+                                                 split(' ')))
+
     @staticmethod
     def _parse_data(data_buffer: bytes):
         data = array_from_iter(map(lambda x: x[0], iter_unpack('d', data_buffer)), dtype=float)
@@ -196,18 +207,8 @@ class CalibrationTable:
 
         return complex_data
 
-    def _parse_attributes(self):
-        self.observation_mode = int(self.observation_mode)
-        self.calibration_version = int(self.calibration_version)
-        if isinstance(self.calibration_ppsdelay, str):
-            self.calibration_ppsdelay = list(map(int, self.calibration_ppsdelay.
-                                                 lstrip('[').
-                                                 rstrip(']').
-                                                 strip().
-                                                 split(' ')))
-
     def __post_init__(self):
-        self._parse_attributes()
+        self._parse_header()
 
     def __eq__(self, other):
         return super().__eq__(other) and array_equal(self.data, other.data)