Graphics, Figures & Tables ⇒ Column width of a complex table

[Marco9518]

Good morning everyone.
I am writing here to ask for help for an issue i cannot solve.
I am trying to generate the following table:

Code: Select all

\begin{table}[H]
    \centering
    \resizebox{\textwidth}{!}{%
    \begin{tabular}{|cccccccccccccc|}
    \hline 
    \multicolumn{14}{|c|}{DRAG} \\ \hline
    \multicolumn{2}{|c|}{\multirow{2}{*}{}} & \multicolumn{12}{c|}{a} \\ \cline{3-14} 
    \multicolumn{2}{|c|}{} & \multicolumn{1}{c|}{-90} & \multicolumn{1}{c|}{-12.5} & \multicolumn{1}{c|}{-10} & \multicolumn{1}{c|}{-5} & \multicolumn{1}{c|}{0} & \multicolumn{1}{c|}{2.5} & \multicolumn{1}{c|}{5} & \multicolumn{1}{c|}{7.5} & \multicolumn{1}{c|}{10} & \multicolumn{1}{c|}{13} & \multicolumn{1}{c|}{15} & 90 \\ \hline
    \multicolumn{1}{|c|}{\multirow{18}{*}{b}} & \multicolumn{1}{c|}{-165} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{0.381} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} &  \\ \cline{2-14} 
    \multicolumn{1}{|c|}{} & \multicolumn{1}{c|}{-90} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{0.013} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} &  \\ \cline{2-14} 
    \multicolumn{1}{|c|}{} & \multicolumn{1}{c|}{-15} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{-0.288} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} &  \\ \cline{2-14} 
    \multicolumn{1}{|c|}{} & \multicolumn{1}{c|}{-12.5} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{-0.287} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} &  \\ \cline{2-14} 
    \multicolumn{1}{|c|}{} & \multicolumn{1}{c|}{-10} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{-0.300} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} &  \\ \cline{2-14} 
    \multicolumn{1}{|c|}{} & \multicolumn{1}{c|}{-7.5} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{-0,306} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} &  \\ \cline{2-14} 
    \multicolumn{1}{|c|}{} & \multicolumn{1}{c|}{-5} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{-0,280} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} &  \\ \cline{2-14} 
    \multicolumn{1}{|c|}{} & \multicolumn{1}{c|}{0} & \multicolumn{1}{c|}{0,930} & \multicolumn{1}{c|}{-0,425} & \multicolumn{1}{c|}{-0,402} & \multicolumn{1}{c|}{-0,307} & \multicolumn{1}{c|}{-0,286} & \multicolumn{1}{c|}{-0,255} & \multicolumn{1}{c|}{-0,309} & \multicolumn{1}{c|}{-0,364} & \multicolumn{1}{c|}{-0,385} & \multicolumn{1}{c|}{-0,427} & \multicolumn{1}{c|}{-0,458} & 0,930 \\ \cline{2-14} 
    \multicolumn{1}{|c|}{} & \multicolumn{1}{c|}{2.5} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{-0,275} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} &  \\ \cline{2-14} 
    \multicolumn{1}{|c|}{} & \multicolumn{1}{c|}{5} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{-0,271} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} &  \\ \cline{2-14} 
    \multicolumn{1}{|c|}{} & \multicolumn{1}{c|}{7.5} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{-0,277} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} &  \\ \cline{2-14} 
    \multicolumn{1}{|c|}{} & \multicolumn{1}{c|}{10} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{-0,298} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} &  \\ \cline{2-14} 
    \multicolumn{1}{|c|}{} & \multicolumn{1}{c|}{15} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{-0,302} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} &  \\ \cline{2-14} 
    \multicolumn{1}{|c|}{} & \multicolumn{1}{c|}{30} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{-0,271} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} &  \\ \cline{2-14} 
    \multicolumn{1}{|c|}{} & \multicolumn{1}{c|}{60} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{0,020} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} &  \\ \cline{2-14} 
    \multicolumn{1}{|c|}{} & \multicolumn{1}{c|}{90} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{0,064} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} &  \\ \cline{2-14} 
    \multicolumn{1}{|c|}{} & \multicolumn{1}{c|}{120} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{-0,062} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} &  \\ \cline{2-14} 
    \multicolumn{1}{|c|}{} & \multicolumn{1}{c|}{150} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{0,618} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} & \multicolumn{1}{c|}{} &  \\ \hline
    \end{tabular}%
    }
    \caption{\small Fx}
    \label{tab:Fxb}
\end{table}

I need to set the width of the columns of the "inner" table, the part of the table where all the cells have all the borders. Can anyone help me?
Thank you in advance!

[kaiserkarl13]

This table is a big mess, and it's not at all clear what you're actually trying to do either. You don't need to use multicolumn for every single cell; the ones that need multicolumns are things like the top row (a single cell that spans 15 "normal" cells), the second row, etc.