In attachment, a minimal non working example. Would you know how to place the tag at the end of the line?
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Code, edit and compile here:
\documentclass{jnm}\usepackage[T1]{fontenc}\usepackage[utf8]{inputenc}\usepackage[cmex10]{amsmath}\usepackage{array}\usepackage{graphicx}\usepackage{caption}\usepackage{subcaption}\usepackage{hyperref}\usepackage{empheq}\newcommand\lr[1]{\left(#1\right)}\begin{document}Text\begin{empheq}[]{align*}\tag{$E_x$} E_x =& \phantom{+} \frac{1}{16\lr{1-\frac{1}{\pi}\alpha_x}} \\&\times\left[4\lr{1-\frac{2}{\pi}\alpha_x} \lr{E_{x,1}^{\rm blue} + E_{x,2}^{\rm blue} + E_{x,3}^{\rm blue} + E_{x,4}^{\rm blue}}\right. \notag \\&+ \lr{\frac{2}{\pi}\alpha_x} \lr{E_{x,1}^{\rm orange} + E_{x,2}^{\rm orange} + E_{x,3}^{\rm orange} + E_{x,4}^{\rm orange}} \notag \\&+ \left.\lr{\frac{2}{\pi}\alpha_x} \lr{E_{x,1}^{\rm green} + E_{x,2}^{\rm green} + E_{x,3}^{\rm green} + E_{x,4}^{\rm green}}\right] \notag \\%&\rule[10pt]{100pt}{0.1pt}\\E_y =& \phantom{+} \frac{1}{16\lr{1-\frac{1}{\pi}\alpha_y}} \\&\times\left[ \lr{\frac{2}{\pi}\alpha_y}\lr{E_{y,1}^{\rm blue} + E_{y,2}^{\rm blue} + E_{y,3}^{\rm blue} + E_{y,4}^{\rm blue}} \right. \notag \\&+ 4\lr{1-\frac{2}{\pi}\alpha_y}\lr{E_{y,1}^{\rm orange} + E_{y,2}^{\rm orange} + E_{y,3}^{\rm orange} + E_{y,4}^{\rm orange}} \notag \\&+ \left.\lr{\frac{2}{\pi}\alpha_y}\lr{E_{y,1}^{\rm green} + E_{y,2}^{\rm green} + E_{y,3}^{\rm green} + E_{y,4}^{\rm green}}\right] \notag \\%&\rule[10pt]{100pt}{0.1pt}\\E_z =& \frac{1}{16\lr{1-\frac{1}{\pi}\alpha_z}} \\& \times \left[\lr{\frac{2}{\pi}\alpha_z}\lr{E_{z,1}^{\rm blue} + E_{z,2}^{\rm blue} + E_{z,3}^{\rm blue} + E_{z,4}^{\rm blue}}\right. \notag \\&+ \lr{\frac{2}{\pi}\alpha_z}\lr{E_{z,1}^{\rm orange} + E_{z,2}^{\rm orange} + E_{z,3}^{\rm orange} + E_{z,4}^{\rm orange}} \notag \\&+ \left.4\lr{1-\frac{2}{\pi}\alpha_z}\lr{E_{z,1}^{\rm green} + E_{z,2}^{\rm green} + E_{z,3}^{\rm green} + E_{z,4}^{\rm green}} \right. \notag\end{empheq}Text\end{document}
