Changes in multiplicative bias when the morphological parameters of all input galaxies are increased by a certain fraction. Top panels: the shifts of the multiplicative bias caused by changing morphological parameter values. The three shift points correspond to the increased factor of 1 + 1σ (dark red), 1 + 2σ (dark orange) and 1 + 3σ (dark green), where σ denotes the median relative uncertainties reported by Griffith et al. (2012; σ = 5%,5%,10% for the half-light radius, the axis ratio and Sérsic index, respectively). The hatched regions indicate the nominal 0.01 error budget for comparison. Bottom panels: the normalised histograms comparing before and after changing morphological parameter values. We note that we shifted all galaxies by the same fraction, resulting in an overall shift of the whole distribution, which corresponds to the most extreme cases, as the uncertainty on the entire distribution is much smaller than on individual values.