How to use the bamnostic.bai.Chunk function in bamnostic

that share the same bin. A `Chunk` object in the context of
        this function is a `namedtuple` that contains the virtual offsets
        for the beginning and end of each of these chunks.

        Note: a special case of a chunk is in any Bin labeled as 37450.
        These bins always contain 2 chunks that provide the statistics
        of the number of reads that are unmapped to that reference.

        Args:
            n_chunks (int): number of chunks to be unpacked from stream

        Returns:
            chunks (list): a list of Chunk objects with the attributes of
                            chunks[i] are .voffset_beg and voffset_end
        """
        chunks = [Chunk(self._io) for chunk in range(n_chunks)]
        return chunks