def write_header(self):
        """Write `header` to `file`.

        See Also
        --------
        write_data
        """
        for properties in self.header.values():
            value = properties['value']
            offset_bytes = int(properties['offset'])
            self.file.seek(offset_bytes)
            value.tofile(self.file)
Write `header` to `file`.

        See Also
        --------
        write_data