mandelbrot {
    xrange( -1.3,-1.18 );
    yrange( -0.19,-0.13 );
    maxiter( 512 );
    spread_colours( 0,127,255,255,255,127,0,0 );
    spread_colours( 128,511,127,0,0,255,255,0 );
    spread_colours( 0,0,0,0,0,0,0,0 );

    show( bsm );
    };

