def reader(start_sinogram=0, end_sinogram=0, step_sinogram=1, start_projection=0, end_projection=0, step_projection=1,
           sinograms_per_chunk=0, projections_per_chunk=0):

    """
    Function to expose input tomography array parameters in function pipeline GUI

    Parameters
    ----------
    start_sinogram : int
        Start for sinogram processing
    end_sinogram : int
        End for sinogram processing
    step_sinogram : int
        Step for sinogram processing
    start_projection : int
        Start for projection processing
    end_projection : int
        End for projection processing
    step_projection : int
        Step for projection processing
    sinograms_per_chunk : int
        Number of sinograms processed at one time. Limited by machine memory size

    Returns
    -------
    tuple, tuple, int:
        Arguments rearranged into tuples to feed into reconstruction
    """

    return (start_projection, end_projection, step_projection), (start_sinogram, end_sinogram, step_sinogram), \
           sinograms_per_chunk, projections_per_chunk