attenuation = numpy.array([[[-21.25,-15.25,-9.25,-3.25,03.25,09.25,15.25,21.25],
		         [-21.25,-15.25,-9.25,-3.25,03.25,09.25,15.25,21.25],
   		         [-21.25,-15.25,-9.25,-3.25,03.25,09.25,15.25,21.25],
		         [-21.25,-15.25,-9.25,-3.25,03.25,09.25,15.25,21.25],
		         [-21.25,-15.25,-9.25,-3.25,03.25,09.25,15.25,21.25],
		         [-21.25,-15.25,-9.25,-3.25,03.25,09.25,15.25,21.25],
		         [-21.25,-15.25,-9.25,-3.25,03.25,09.25,15.25,21.25],
		         [-21.25,-15.25,-9.25,-3.25,03.25,09.25,15.25,21.25]],
       		         [[21.25,21.25,21.25,21.25,21.25,21.25,21.25,21.25],
		         [15.25,15.25,15.25,15.25,15.25,15.25,15.25,15.25],
		         [09.25,09.25,09.25,09.25,09.25,09.25,09.25,09.25],
		         [03.25,03.25,03.25,03.25,03.25,03.25,03.25,03.25],
		         [-03.25,-03.25,-03.25,-03.25,-03.25,-03.25,-03.25,-03.25],
		         [-09.25,-09.25,-09.25,-09.25,-09.25,-09.25,-09.25,-09.25],
		         [-15.25,-15.25,-15.25,-15.25,-15.25,-15.25,-15.25,-15.25],
    		         [-21.25,-21.25,-21.25,-21.25,-21.25,-21.25,-21.25,-21.25]]])