The two lower diagonal arrows in the following diagram are obviously not exactly parallel. How can I arrange them correctly?
\documentclass{article}
\usepackage{tikz-cd}
\usepackage{amsmath}
\begin{document}
\begin{center}
\begin{tikzcd}[column sep={{{{3em,between origins}}}}]%[bo column sep=3em]
A' \arrow{rr}[pos=0.25]{f} \arrow{dd}[swap,pos=0.25]{a} \arrow{rd}[inner sep=1pt]{1_{A'}} && B'' \arrow{dd}[pos=0.25]{\iota_{B''}} \arrow{rd}[inner sep=1pt]{\iota_{B''}}\
{} & A' \arrow{ld}[swap,inner sep=1pt]{a} \arrow{rr}[pos=0.25]{\iota_A\circ a} &&{A}\amalg_{A'}{B''} \arrow{dl}[inner sep=1pt]{1_{{A}\amalg_{A'}{B''}}}\
A \arrow[swap]{rr}[pos=0.25]{\iota_A} && \smash[b]{{A}\amalg_{A'}{B''}}\
\end{tikzcd}
\end{center}
\end{document}
Best Answer
In this case, I'd suggest you to hide the width of the widest terms using
\makebox
: