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I am making a commutative diagram using tikz-cd. However, I am having trouble with the vertical placement of the arrow labels. As you can see in the picture, the fraction \tfrac{a}{b_0} shrinks the left and right arrows. Therefore the labels \phi are not on the same height as the label of the middle arrow. Is there a possibility to vertically align all arrow labels so that they are on the same height?

Vertical label misplacement in tikz-cd

Here is a minimal working example producing the diagram.

\documentclass{article} \usepackage{amsmath} \usepackage{tikz-cd} \begin{document} \begin{tikzcd}[row sep=large] 0\arrow[r]&\tfrac{a}{b_0}X\arrow[d,"\phi"]\arrow[r]&X\arrow[d,"\phi"'] \arrow[r] & X/\tfrac{a}{b_0}X\arrow[d,"\phi"']\arrow[r]&0\\ 0\arrow[r]&\tfrac{a}{b_0}Y\arrow[r] &Y \arrow[r]& Y/\tfrac{a}{b}Y\arrow[r]&0 \end{tikzcd} \end{document}
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In addition to Salim's answer, you could use a \vphantom with any content you like: 

% arara: pdflatex % arara: pdflatex \documentclass{article} \usepackage{amsmath} \usepackage{tikz-cd} \begin{document} \begin{tikzcd}[row sep=large,remember picture] 0\arrow[r]&\tfrac{a}{b_0}X\arrow[d,"\phi"]\arrow[r]&\vphantom{\tfrac{a}{b_0}}X\arrow[d,"\phi"'] \arrow[r] & X/\tfrac{a}{b_0}X\arrow[d,"\phi"']\arrow[r]&0\\ 0\arrow[r]&\tfrac{a}{b_0}Y\arrow[r] &Y \arrow[r]& Y/\tfrac{a}{b}Y\arrow[r]&0 \end{tikzcd} \begin{tikzpicture}[remember picture,overlay] \draw[thick,red] ([xshift=-1cm,yshift=-.99cm]\tikzcdmatrixname-1-1.west) -- ([xshift=1cm,yshift=-.99cm]\tikzcdmatrixname-1-5.east); \end{tikzpicture} \end{document}

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  • I prefer this answer because it doesn't require "hardcoding" vertical distances and therefore it is more applicable in my situation, but both work very well. Commented Sep 15, 2016 at 14:44
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Labels are not aligned because depth for first row elements are not equal, you can define a strut to made them equal. For the second row just simple \strut suffice to obtain equal height 

\documentclass{article} \usepackage{amsmath} \usepackage{tikz-cd} \def\mystrut{\vrule width0pt height.7\baselineskip depth.4\baselineskip} \begin{document} \begin{tikzcd}[row sep=large] 0\arrow[r]&\mystrut \tfrac{a}{b_0}X\arrow[d,"\phi"]\arrow[r]& \mystrut X\arrow[d,"\phi"'] \arrow[r] & \mystrut X/\tfrac{a}{b_0}X\arrow[d,"\phi"']\arrow[r]&0\\ 0\arrow[r]&\strut \tfrac{a}{b_0}Y\arrow[r] & \strut Y \arrow[r]& \strut Y/\tfrac{a}{b}Y\arrow[r]&0 \end{tikzcd} \end{document}

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