private static void printGerber(ArrayList<Eisenstein> primes) throws Exception {
	System.out.println(GerberPlottables.GERBER_HEADER);
	System.out.println("G75*");
	int scale = 1000;
	//	double radius = scale/2*2/Math.sqrt(3);
	double radius = scale/2;
	for(Eisenstein e: primes)
	    System.out.println(GerberPlottables.circle(e.mul(scale).toCoordinate(), radius));
	System.out.println(GerberPlottables.GERBER_FOOTER);
    }