Correlation of host galaxy stellar mass (in units of ) with Hubble diagram residuals for the SNLS (blue dots), SDSS (red dots), and low-redshift (green dots) surveys. The separation between the two mass bins at corresponds to the median mass value of our sample and is shown as the black vertical dash-dotted line. The bins are drawn in black, with the weighted mean central values as black dots and their dispersion, divided by the square root of the number of elements in the bin. The purple dashed line shows the weighted linear fit for the mass distribution.