Plot table in 2 colors

Question

I have the following result:

but I need this result:

The code I used is the following.

\begin{figure}[H]
    \centering
    \begin{tabularx}{12cm}{c}
        \begin{tikzpicture}
        \begin{axis}[
            ybar,ymin=0,
            width=12cm, height=8cm,
            bar width=15pt,
            x tick label style={
                rotate=-90},
            major x tick style = transparent,
            ymajorgrids = true,
            xtick = data,
            scaled y ticks = false,
            symbolic x coords={4-Pa-Pr, 5-Pa-Pr, 6-Pa-Pr, 6-C-Pr, 6-M-Pr, 6-W-Pr, 7-Pa-Pr, 4-Pa-S, 5-Pa-S, 6-Pa-S, 6-C-S, 6-M-S, 6-W-S, 7-Pa-S},
            ymajorgrids]
            \addplot[fill=red!50] table[x=Sample,y=BD] {BulkDensity.dat};
        \end{axis}
        \end{tikzpicture}
    \end{tabularx}
    \caption{Bulk Density (g/cm\ap{3})}
    \label{fig:BD}
\end{figure}

see also http://tex.stackexchange.com/questions/209656/change-color-of-individual-bars-in-histogram-of-binomial-distribution or http://tex.stackexchange.com/questions/219213/tikz-addplot-fill-between-depending-on-sign — Marijn, Oct 12 '15 at 15:19
You can combine the techniques in the links provided by Marijn, together with the key skip first n (see section "4.3.2 Reading Coordinates From Tables" of pgfplots manual) to plot the last part of the histogram in red. — LucaD, Oct 12 '15 at 15:30
Not related but, why are you using tabularx in your example? — LucaD, Oct 12 '15 at 15:32
@LucaD I don't know :) Actually is better to use tabular, isn't it? — Stefano, Oct 12 '15 at 16:12
@stefano No, I think you don't need it nor any tabular environment, so I was asking if there was a specific reason. If not, I think you should not use it. — LucaD, Oct 12 '15 at 16:21

Plot table in 2 colors

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