Upper bounds on the relative ULA density Ω_a in each logarithmic ULA mass bin. The left plot shows the upper bounds on Ω_a on a linear scale, and the right plot shows the upper bounds on a logarithmic scale. The bar height indicates the 95% confidence interval. The orange bars indicate the bounds obtained by eRASS1 galaxy clusters only, and the gray hatched bars show the bounds obtained from Planck 2015 CMB data by Hložek et al. (2018). The red bars show the bounds obtained from combining the bounds from eRASS1 galaxy clusters with those from Planck 2015 CMB data.