docs: def check_line_length(self, splitted_line, expected_length):
          """
          Check if the line is correctly formated. Throw a SyntaxError if it is not.
          """
          if len(splitted_line) != expected_length:
              raise WrongLineFormat(
                              message='WRONG FORMATED PED LINE!',
                              ped_line = '\t'.join(splitted_line))
          return