Errors are except when explicitly stated.
Notice that the scale is different for the two plots. This suggests that there is an amount of HI contained within the cluster itself. Only the abundances of Ni and Fe are not compatible with zero at 1 level and, except for these two elements, we can only give upper limits for the abundance. A fit with a single temperature model shows a significant increase in the hydrogen column density and a decrease in temperature relative to the values obtained when we fitted the whole cluster. In a previous study, Pislar et al.