Stacked bar-plot: display total value

Question

Is there a way to make pgfplots display only the total value of a stacked bar-plot?

With nodes near coords, all segment-values are shown:

I'm only interested in the sum of the stacks, though. Basically, the last brown-ish value printed in black would be perfect.

Here's the MWE which generates the picture above:

\documentclass{article}
\usepackage{pgfplots}

\pgfplotsset{testbar/.style={
    xbar stacked,
    width=.8\textwidth,
    axis y line*= none, axis x line*= bottom,
    xmajorgrids = true,
    xmin=0,xmax=70,
    ytick = data, yticklabels = {C1,C2},
    tick align = outside, xtick pos = left,
    bar width=6mm, y=8mm,
    enlarge y limits={abs=0.625},% 0.5 + 0.5*(y - bar width)/y [TeX.sx #47995]
    nodes near coords,
    nodes near coords align={horizontal},
}}

\begin{document}

\begin{tikzpicture}
    \begin{axis}[testbar] 
        \addplot coordinates{(2.68,1) (2.94,0)};
        \addplot coordinates{(26.63,1) (31.67,0)};
        \addplot coordinates{(6.2,1) (9.91,0)};
    \end{axis}
\end{tikzpicture}

\end{document}

Answer 1

You can just apply the nodes near coords option to the third dataseries, using \addplot +[nodes near coords] coordinates.... That way, the labels will only be generated for that series.

\documentclass[border=5mm]{standalone}
\usepackage{pgfplots}

\pgfplotsset{testbar/.style={
    xbar stacked,
    width=.8\textwidth,
    axis y line*= none, axis x line*= bottom,
    xmajorgrids = true,
    xmin=0,xmax=70,
    ytick = data, yticklabels = {C1,C2},
    tick align = outside, xtick pos = left,
    bar width=6mm, y=8mm,
    enlarge y limits={abs=0.625},% 0.5 + 0.5*(y - bar width)/y [TeX.sx #47995]
}}

\begin{document}

\begin{tikzpicture}
    \begin{axis}[testbar] 
        \addplot coordinates{(2.68,1) (2.94,0)};
        \addplot coordinates{(26.63,1) (31.67,0)};
        \addplot +[
            nodes near coords,
            nodes near coords align={horizontal},
            every node near coord/.append style={
                black,
                fill=white,
                fill opacity=0.75,
                text opacity=1,
                outer sep=\pgflinewidth % so the label fill doesn't overlap the plot
            }
        ]coordinates{(6.2,1) (9.91,0)};
    \end{axis}
\end{tikzpicture}

\end{document}