\begin{table}
\centering
\begin{tblr}[         %% tabularray outer open
]                     %% tabularray outer close
{                     %% tabularray inner open
colspec={Q[]Q[]Q[]},
hline{2}={1-3}{solid, black, 0.05em},
hline{1}={1-3}{solid, black, 0.08em},
hline{5}={1-3}{solid, black, 0.08em},
}                     %% tabularray inner close
x3 & x4 & x5 \\
900. & 900.5 & 900.5 \\
1000. & 1000. & 1000.5 \\
1100. & 1100. & 1100.5 \\
\end{tblr}
\end{table} 
