mandelbrot {
    xrange( -1.6,-1.2);
    yrange( -0.2,0.2);
    maxiter( 512 );
    spread_colours( 0,127,255,255,255,127,0,0 );
    spread_colours( 128,511,127,0,0,255,255,255 );
    spread_colours( 0,0,0,0,0,0,0,0 );

    show( bsm );
    };

