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\documentclass[11pt,a4paper]{article}
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\usepackage{chemformula}
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\usepackage{pgfplotstable}
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% word "tabla", so it can be used like "cuadro" ;)
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\rhead{David Díaz, Adrià Vilanova}
\lhead{Práctica 3}
\rfoot{\thepage}
%%%% Title %%%%
\title{\vspace{-2ex}Práctica 3. Medida de la tensión superficial por el método del anillo (Método de Du Nouy)}
\author{David Díaz, Adrià Vilanova\vspace{-2ex} }
\date{Primavera 2020-21}
\begin{document}
\maketitle
\begin{center}
\centering
\input{graph.tex}
\captionof{figure}{Gráfica donde se muestra la tensión superficial $\gamma$ de la mezcla agua/etanol en función de la concentración volúmica $c$ de etanol en la mezcla a temperatura del laboratorio.}
\label{fig:graph}
\end{center}
\begin{center}
\centering
\begin{adjustbox}{width=\textwidth}
\pgfplotstabletypeset[
columns={5, 2, 0, 7, 8, 9, 10, 12},
columns/5/.style={column name=$V_{\text{H}_2\text{O}} \, (\si{\milli\liter})$, fixed, fixed zerofill, precision=1},
columns/2/.style={column name=$V_\text{etanol} \, (\si{\milli\liter})$, fixed, fixed zerofill, precision=1},
columns/0/.style={column name=$c_\text{etanol}$, fixed, fixed zerofill, precision=2},
columns/7/.style={column name=$F_1 \, (\si{\milli\newton})$, fixed, fixed zerofill, precision=1},
columns/8/.style={column name=$F_2 \, (\si{\milli\newton})$, fixed, fixed zerofill, precision=1},
columns/9/.style={column name=$F_3 \, (\si{\milli\newton})$, fixed, fixed zerofill, precision=1},
columns/10/.style={column name=$\bar{F} \, (\si{\milli\newton})$, fixed, fixed zerofill, precision=1},
columns/12/.style={column name=$\gamma \, (\si{\milli\newton\per\meter})$, fixed, fixed zerofill, precision=1}
]{datatable.dat}
\end{adjustbox}
\captionof{table}{Datos experimentales obtenidos. Se ha considerado un error de $\SI{0.5}{\milli\liter}$ para $V_{\text{H}_2\text{O}}$ y $V_\text{etanol}$. Los errores de $c$ y $\gamma$ (en la figura \ref{fig:graph}) se han calculado por propagación de errores, y los demás valores tienen el error correspondiente a las cifras significativas mostradas.}
\end{center}
\end{document}