Bias in reconstructed distance modulus as a function of redshift. Simulations follow the color variation model described in Scolnic et al. (2014, Sect. 3.1). The simulated sample includes low-z, SDSS-II and SNLS SNe Ia and is representative of our JLA sample described in Sect. 5.1. The analysis of the simulated sample includes the bias correction described in Sect. 5.3 (computed under the baseline SALT2 assumptions). The SALT2 model was not retrained on the simulated sample, similarly to what is done in Kessler et al. (2013).