list(t = structure(.Data = 
		    c(12,    1, 21, 25, 11, 26, 27, 30, 13, 12, 21, 20, 23, 25, 23, 29, 35, NA, 31, 36,  
			 32, 27, 23, 12, 18, NA, NA, 38, 29, 30, NA, 32, NA, NA, NA, NA, 25, 30, 37, 27,  
			 22, 26, NA, 28, 19, 15, 12, 35, 35, 10, 22, 18, NA, 12, NA, NA, 31, 24, 37, 29,  
			 27, 18, 22, 13, 18, 29, 28, NA, 16, 22, 26, 19, NA, NA, 17, 28, 26, 12, 17, 26),
			.Dim = c(4, 20)),
		t.cen = structure(.Data = 
		    c(  0,   0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0, 40,  0,  0,  
			    0,   0,  0,  0,  0, 40, 40,  0,  0,  0, 40,  0, 40, 40, 40, 40,  0,  0,  0,  0,  
			    0,  0, 10,  0,  0,  0,  0,  0,  0,  0,  0,  0, 24,  0, 40, 40,  0,  0,  0,  0,  
			    0,  0,  0,  0,  0,  0,  0, 20,  0,  0,  0,  0, 29, 10,  0,  0,  0,  0,  0,  0),
			.Dim = c(4, 20)),
		M = 4, N = 20)