Dependence on the upper Hubble-diagram redshift, ﹩{z}_{{\rm{HD}},{\rm{\max }}}﹩. The DES-DOVEKIE offset is measured once from the 196 overlaps at ﹩{z}_{{\rm{HD}},{\rm{\max }}}=0.151﹩ and is then held fixed. (a) Values of H₀ for corrected Pantheon+ (full rung replacement case) and DES-DOVEKIE (fixed weighted-mean offset case). The pale band is the H0DN baseline 1σ interval. (b) Changes relative to the first point. Because the samples are nested, the lower-panel error bars use the covariance between redshift cuts rather than the individual H₀ errors added in quadrature. Both sequences rise as more distant supernovae are included.