我想要一张这样的桌子：
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%% LyX 2.0.6 created this file. For more info, see http://www.lyx.org/.
%% Do not edit unless you really know what you are doing.
\documentclass[spanish,english]{scrartcl}
\usepackage[T1]{fontenc}
\usepackage[latin9]{inputenc}
\makeatletter
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% LyX specific LaTeX commands.
%% Because html converters don't know tabularnewline
\providecommand{\tabularnewline}{\\}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% User specified LaTeX commands.
\usepackage{lipsum}
\usepackage{array}
\newcolumntype{C}{>{\centering\arraybackslash}m{10em}}
\usepackage{amsmath}
\makeatother
\usepackage{babel}
\addto\shorthandsspanish{\spanishdeactivate{~<>}}
\begin{document}
\selectlanguage{spanish}%
\begin{center}
\begin{table}
\begin{centering}
\begin{tabular}[b]{|c|C|C|C|}
\hline
Fkrmula & \multicolumn{3}{c|}{$\frac{2\alpha}{\beta+5.4\cos{\left(\pi\gamma\right)}}$}\tabularnewline
\hline
Error & \multicolumn{3}{c|}{$\sqrt{4\left\lvert {\frac{\Delta_{\alpha}}{\beta+5.4\cos{\left(\pi\gamma\right)}}}\right\rvert ^{2}+4\left\lvert {\frac{\Delta_{\beta}\alpha}{\left(\beta+5.4\cos{\left(\pi\gamma\right)}\right)^{2}}}\right\rvert ^{2}+116.64\pi^{2}\left\lvert {\frac{\Delta_{\gamma}\alpha\sin{\left(\pi\gamma\right)}}{\left(\beta+5.4\cos{\left(\pi\gamma\right)}\right)^{2}}}\right\rvert ^{2}}$ }\tabularnewline
\hline
Variable & $\beta$ & $\gamma$ & $\alpha$\tabularnewline
\hline
Valor & $1.02$ & $0.600$ & $5.0$\tabularnewline
\hline
Error & $0.10$ & $0.006$ & $0.5$\tabularnewline
\hline
Error en resultado & $2.4$ & $2.3$ & $1.5$\tabularnewline
\hline
Error total & \multicolumn{3}{c|}{$3.7$}\tabularnewline
\hline
Resultado & \multicolumn{3}{c|}{$-15\pm4$}\tabularnewline
\hline
\end{tabular}
\par\end{centering}
\caption{Errores}
\end{table}
\par\end{center}\selectlanguage{english}%
\end{document}
三个小柱子均匀分布。我试过此解决方案，但当我设置正确的宽度参数时，列数才大致相等。问题是我不知道单元格内会有什么（因为表格是自动生成的），也不知道列数，也不想每次都手动设置宽度；也就是说，第二行中的公式可以更长或更短，并且每个表格的 var 列数可以不同。
理想情况下，生成的表应该可以在普通 lyx gui（不是 ERT）中编辑。
另外，我希望公式的垂直间距更大。