</mn></msubsup><mo>+</mo><msubsup><mtext mathvariant="normal">se</mtext><msub><mi>J</mi><mi>k</mi></msub><mn>2</mn></msubsup></mtd><mtd columnalign="center" style="text-align: center"></mtd></mtr><mtr><mtd columnalign="center" style="text-align: center"></mtd></mtr></mtable><mo stretchy="true" form="postfix">]</mo></mrow><mi>.</mi></mtd></mtr></mtable><annotation encoding="application/x-tex">
\begin{aligned}
   y_{k,.}  &amp;\sim \text{MN}(\mu, \text{S}),\\
   \text{S} &amp;= \begin{bmatrix} 
      \tau_b^2