ΔC_l due to leakage from E-mode for different times on measurements per baseline t_b = 1 s, 10 s and, 100 s for the QUBIC instrument. The colored solid lines represent the leakage after applying the self-calibration method for different measuring times per baseline. The dashed line represents the error on the B-mode power spectrum without self-calibration method. The black lines are the primordial B-mode spectrums for r = 10^-1, r = 10^-2, and r = 10^-3.