Table

\documentclass[11pt,a4paper]{article}       % Alternativet er å bruke {report}, men vi holder oss helst til {article} i labrapportene.
\usepackage{booktabs}
\usepackage[norsk]{babel}
\usepackage{color}
\usepackage{graphicx}

\begin{document}

\begin{table}[h!tb]
    \centering
        \caption{beregnede og målte verdier av magnetfeltet $B$ på aksen til en kort spole s,f.a. avstanden $x$ fra spolens midtplan.}
        \vspace{0.5cm}                      % Litt ekstra plass for å få det til å se penere ut.
        \label{Tabell2}\resizebox{15cm}{!}{
        \begin{tabular}{@{}*{10}{r@{}}}
            \toprule                        % Horisontal linje.     &
\multicolumn{1}{p{1cm}}{\centering {\color{white}|}\vspace*{-0.3cm} \newline \hspace*{0.1cm} $x$     \newline ($m$) }                   &
\multicolumn{1}{p{2cm}}{\centering $a=2R$ \newline \hspace*{0.05cm} Beregnet   \newline \hspace*{0.3cm}  $B_1$       \newline (gauss)}  &
\multicolumn{1}{p{2cm}}{\centering $a= R$ \newline \hspace*{0.15cm} Beregnet   \newline \hspace*{0.25cm} $B_1$       \newline (gauss)}  &
\multicolumn{1}{p{2cm}}{\centering $a=R/2$\newline \hspace*{0.15cm} Beregnet   \newline \hspace*{0.25cm} $B_1$       \newline (gauss)}  &
\multicolumn{1}{p{2cm}}{\centering $a=2R$ \newline \hspace*{0.05cm} Målt       \newline \hspace*{0.1cm}  $B_2$       \newline (gauss)}  &
\multicolumn{1}{p{2cm}}{\centering $a=2R$ \newline \hspace*{0.05cm} Differanse \newline \hspace*{0.1cm}  $B_2 - B_1$ \newline (\%}      &
\multicolumn{1}{p{2cm}}{\centering $a= R$ \newline \hspace*{0.05cm} Målt \newline\hspace*{0.1cm}  $B_2$ \newline (prosent)}             &
\multicolumn{1}{p{2cm}}{\centering $a= R$ \newline \hspace*{0.05cm} Differanse \newline\hspace*{0.1cm}  $B_2 - B_1$ \newline (\%)}      &
\multicolumn{1}{p{2cm}}{\centering $a=R/2$\newline \hspace*{0.05cm} Målt \newline\hspace*{0.1cm}  $B_2$ \newline (prosent)}             &
\multicolumn{1}{p{2cm}}{\centering $a=R/2$\newline \hspace*{0.05cm} Differanse \newline\hspace*{0.1cm}  $B_2 - B_1$ \newline (\%)}       \\
              \midrule
-0,18   &  5,265    &  3,365    &  2,981    &  5,31     &  0,864    &  3,34     & -0,743    &  3,01     &  0,959 \\
-0,16   &  7,725    &  4,667    &  4,057    &  7,77     &  0,584    &  4,60     & -1,439    &  4,08     &  0,559 \\
-0,14   & 11,595    &  6,666    &  5,675    & 11,61     &  0,131    &  6,58     & -1,293    &  5,68     &  0,084 \\
-0,12   & 17,398    &  9,797    &  8,175    & 17,48     &  0,470    &  9,62     & -1,811    &  8,17     & -0,061 \\
-0,10   & 24,796    & 14,694    & 12,114    & 24,71     & -0,345    & 14,35     & -2,338    & 12,04     & -0,607 \\
-0,08   & 30,955    & 21,937    & 18,306    & 30,82     & -0,436    & 21,46     & -2,175    & 18,10     & -1,125 \\
-0,06   & 31,701    & 30,981    & 27,529    & 31,61     & -0,288    & 30,59     & -1,262    & 27,27     & -0,940 \\
-0,04   & 27,387    & 38,714    & 39,223    & 27,42     &  0,121    & 38,68     & -0,088    & 38,99     & -0,595 \\
-0,02   & 22,688    & 41,914    & 49,688    & 22,67     & -0,080    & 42,49     &  1,375    & 49,85     &  0,326 \\
 0,00   & 20,852    & 42,202    & 53,852    & 20,74     & -0,538    & 43,00     &  1,892    & 54,31     &  0,850 \\
 0,02   & 22,688    & 41,914    & 49,688    & 22,49     & -0,873    & 42,46     &  1,303    & 50,04     &  0,708 \\
 0,04   & 27,387    & 38,714    & 39,223    & 27,00     & -1,412    & 39,01     &  0,764    & 39,36     &  0,349 \\
 0,06   & 31,701    & 30,981    & 27,529    & 31,42     & -0,887    & 31,16     &  0,578    & 27,63     &  0,368 \\
 0,08   & 30,955    & 21,937    & 18,306    & 31,00     &  0,145    & 22,06     &  0,560    & 18,41     &  0,568 \\
 0,10   & 24,796    & 14,694    & 12,114    & 25,13     &  1,348    & 14,88     &  1,269    & 12,15     &  0,301 \\
 0,12   & 17,398    &  9,797    &  8,175    & 17,83     &  2,482    &  9,89     &  0,945    &  8,26     &  1,040 \\
 0,14   & 11,595    &  6,666    &  5,675    & 11,91     &  2,718    &  6,77     &  1,558    &  5,74     &  1,141 \\
 0,16   &  7,725    &  4,667    &  4,057    &  8,00     &  3,561    &  4,74     &  1,561    &  4,13     &  1,792 \\
 0,18   &  5,265    &  3,365    &  2,981    &  5,39     &  2,384    &  3,45     &  2,526    &  3,04     &  1,965 \\
            \bottomrule
        \end{tabular}}
\end{table}

\end{document}