mandelbrot {
    screen(0,0,640,480);
    xrange(-0.745468,-0.745385);
    yrange( 0.112979,0.113039);
    maxiter( 1024);
    spread_colours( 0,511,255,255,255,0,0,255 );
    spread_colours( 512,1023,0,0,255,0,0,255 );
    spread_colours( 0,0,0,0,0,0,0,0 );

    show( bsm );
    };

