mandelbrot {
    xrange( 0.25,0.3 );
    yrange( -0.02,0.02 );
    maxiter( 512 );
    spread_colours( 0,127,255,255,255,0,127,0 );
    spread_colours( 128,511,0,127,0,255,255,255 );
    spread_colours( 0,0,0,0,0,0,0,0 );

    show( bsm );
    };

