Top panel: multiplicative bias after METADETECTION for galaxies with 20 < m_VIS < 24.5 when the noise is increased by a factor of f_noise with respect to the baseline case, with ϵ_PSF = 0.1. Middle panel: residual multiplicative bias c_i if we use b^sm = 1.217, the estimate for the baseline case. Bottom panel: best estimate for b^sm as a function of f_noise, which shows a clear dependence on the noise level. If ignored, the residual multiplicative biases exceeds Euclid requirements for this level of PSF anisotropy.