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I want to create a table with descriptions with line breaks. Unfortunately, one title is not displayed and I do not know why and how to solve it. My code is the following:

\documentclass{article} \usepackage{rotating} \usepackage{makecell} \usepackage{tabularray} \begin{document} \begin{table} \footnotesize \begin{tblr}{colspec={cQ[c,3cm]Q[c,3cm]Q[c,3cm]Q[c,3cm]}} & \SetCell[c=2]{c} {Chlorination degree of \\ paraffinic compounds $n$\textsubscript{Cl}} & \SetCell[c=2]{c} {Chlorination degree of \\ olefinic compounds $n$\textsubscript{Cl}}\\ & non-exposed (0h) & exposed (144h) & non-exposed (0h) & exposed (144h) \\ Non-hydroxylated & 8.80 $\pm$ 0.00 & 9.07 $\pm$ 0.00 & 8.37 $\pm$ 0.02 & 8.55 $\pm$ 0.01 \\ Mono-hydroxylated & 8.31 $\pm$ 0.06 a) & 7.59 $\pm$ 0.01 & 8.31 $\pm$ 0.06 a) & 7.04 $\pm$ 0.03 \\ Di-hydroxylated & n.d. & 6.61 $\pm$ 0.04 & n.d. & 5.23 $\pm$ 0.01 \\ \end{tblr} \end{table} \end{document}

The output is this:

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As you can see, the description of the last two columns is missing. What it should look like is this:

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The data is taken from https://doi.org/10.1016/j.chemosphere.2020.128288

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2 Answers 2

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At tabularray in contrary to other tables' packages in each rows regardless if in them are multicolumn cells (written as \SetCell[c=2]{c} ... ) had to be all ampersands as defined in table preamble. In your case, the MWE should be:

\documentclass{article} \usepackage{rotating} \usepackage{makecell} \usepackage{tabularray} \usepackage[version=4]{mhchem} % <--- new \begin{document} \begin{table} \footnotesize \begin{tblr}{colspec={c *{4}{Q[c,3cm]}}} & \SetCell[c=2]{c} {Chlorination degree of \\ paraffinic compounds $n_{\ce{Cl}}$} & & \SetCell[c=2]{c} {Chlorination degree of \\ olefinic compounds $n_{\ce{Cl}}$} & \\ & non-exposed (0h) & exposed (144h) & non-exposed (0h) & exposed (144h) \\ Non-hydroxylated & $8.80\pm 0.00$ & $9.07\pm 0.00$ & $8.37\pm 0.02$ & $8.55\pm 0.01$ \\ Mono-hydroxylated & $8.31\pm 0.06$ a) & $7.59\pm 0.01$ & $8.31\pm 0.06$ a) & $7.04\pm 0.03$ \\ Di-hydroxylated & n.d. & $6.61\pm 0.04$ & n.d. & $5.23\pm 0.01$ \\ \end{tblr} \end{table} \end{document}

enter image description here

Edit: For chemical elements (and formulae) is sensible to employ mhchem package and write symbol for chlorine \ce{Cl} or n-clorine $n_{\ce{Cl}}$.

Off-topic: Your table is wider than text area width. So, you may consider the following table preamble:

\begin{tblr}{colspec={l *{4}{X[c]}}}

which gives:

enter image description here

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  • Thanks a lot Zarko. The permeable \begin{tblr}{colspec={l *{4}{X[c]}}} worked. A comment to your suggestion of using \ce{Cl}. This is reasonable in a chemical formula, I agree. But as subscripted term like the used number of chlorine ($n$\textsubscript{Cl})I rather do not want to have it in the \ce{Cl} environment. An option might be $n$\textsubscript{\ce{Cl}}, but I did not test it. Commented Mar 29, 2022 at 13:39
  • @MCK1886, corrected notation for n-chlorine: $n_{\ce{Cl}}$. BTW, since answer solve your problem, you may consider to accept it ;-) Commented Mar 29, 2022 at 13:49
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Do you need tabularray? You can get a better result with the standard tabular* and siunitx.

\documentclass{article} \usepackage{booktabs,siunitx} \usepackage[version=4]{mhchem} \sisetup{ retain-zero-uncertainty, uncertainty-mode=separate, } \begin{document} \begin{table} \centering \setlength{\tabcolsep}{0pt} \newcommand{\splitcell}[2]{% \multicolumn{#1}{c}{\begin{tabular}{@{}c@{}}#2\end{tabular}}% } \newcommand{\?}[1]{\rlap{\textsuperscript{#1}}} \begin{tabular*}{\textwidth}{ @{\extracolsep{\fill}} l S[table-format=1.2(2)] S[table-format=1.2(2)] S[table-format=1.2(2)] S[table-format=1.2(2)] @{} } \toprule & \splitcell{2}{Chlorination degree of \\ paraffinic compounds $n_{\ce{Cl}}$} & \splitcell{2}{Chlorination degree of \\ olefinic compounds $n_{\ce{Cl}}$} \\ \cmidrule{2-3} \cmidrule{4-5} & {non-exposed} & {exposed} & {non-exposed} & {exposed} \\ & {(0h)} & {(144h)} & {(0h)} & {(144h)} \\ \midrule Non-hydroxylated & 8.80 \pm 0.00 & 9.07 \pm 0.00 & 8.37 \pm 0.02 & 8.55 \pm 0.01 \\ Mono-hydroxylated & 8.31 \pm 0.06\?{a} & 7.59 \pm 0.01 & 8.31 \pm 0.06\?{a} & 7.04 \pm 0.03 \\ Di-hydroxylated & {n.d.} & 6.61 \pm 0.04 & {n.d.} & 5.23 \pm 0.01 \\ \bottomrule \end{tabular*} \end{table} \end{document}

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