TT, EE, and TE deconvolved noise spectrum for 30, 44, and 70 GHz. Black: white noise MC simulation. Red: realistic MC simulation. Dashed: estimate based on inverse symmetrized beam window. Green: noise bias from white noise covariance matrix. At 30 GHz we construct the bias for the complete multipole range, by a procedure that assembles the spectrum in pieces. At 44 and 70 GHz we construct the bias for range ℓ = 0−200, and individual values for multipoles ℓ = 300,400...1400.