list(r = c(10, 23, 23, 26, 17, 5, 53, 55, 32, 46, 10,   8, 10,   8, 23, 0,  3, 22, 15, 32, 3),
		 n = c(39, 62, 81, 51, 39, 6, 74, 72, 51, 79, 13, 16, 30, 28, 45, 4, 12, 41, 30, 51, 7),
		 x1 = c(0,   0,  0,   0,   0, 0,   0,   0,  0,   0,   0,  1,   1,   1,   1, 1,   1,  1,   1,   1, 1),
		 x2 = c(0,   0,  0,   0,   0, 1,   1,   1,  1,   1,   1,  0,   0,   0,   0, 0,   1,  1,   1,   1, 1),
		 N = 21)