def METHOD_NAME(memmap_filenames, indices=None,
                                        strs_dtype='float32'):
    """
    Function to reconstruct streamlines from memmaps, mainly to facilitate
    multiprocessing and decrease RAM usage.
    ----------
    memmap_filenames : tuple
        Tuple of 3 filepath to numpy memmap (data, offsets, lengths).
    indices : list
        List of int representing the indices to reconstruct.
    Returns
    -------
    streamlines : list of np.ndarray
        List of streamlines.
    """
    data = np.memmap(memmap_filenames[0],  dtype=strs_dtype, mode='r')
    offsets = np.memmap(memmap_filenames[1],  dtype='int64', mode='r')
    lengths = np.memmap(memmap_filenames[2],  dtype='int32', mode='r')
    return reconstruct_streamlines(data, offsets, lengths, indices=indices)