def make_scatter_file(x, y, z, endian='='):
    """Make the scatter file for the x y z coordinates

    Args
        x: float x coordinate
        y: float y coordinate
        z: float z coordinate

    Keyword Args
        endian: endian value for binary numbers

    Returns:
        str: 'xyz.scat' scatter file name

    """
    import struct
    fid = open('xyz.scat', 'wb')
    fid.write(struct.pack(endian + 'I', 1))
    fid.write(struct.pack(endian + 'III', 1, 1, 1))
    fid.write(struct.pack(endian + 'ffff', x, y, z, 1))
    fid.close()
    return 'xyz.scat'
