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plot {1/2^20((binom(21,{0,1,2,3,4,5,6,7,8,9,10})).((pi/2-z) sinc({21,19,17,15,13,11,9,7,5,3,1}(pi/2-z))+(z)sinc({21,19,17,15,13,11,9,7,5,3,1}(z))))}, {z,0,1.57}