The mass-temperature relation for galaxy groups and clusters in observations, with mass defined inside R₅₀₀ as a function of X-ray temperature. Black squares correspond to stacked bins from eRASS1 observations. Open diamonds represent background modeling instead of background subtraction. The red line shows the scaling relation from (Lovisari et al. 2015), the orange line represents the relation from (Bulbul et al. 2019), and the green dashed line indicates the self-similar model. The blue line corresponds to the best-fit relation. Shaded regions indicate the 1σ and 3σ confidence intervals for the respective relations.