# Contour plot: ignored columns, wrong color-assignment, 1D-interpolation [closed]

This forum has often been of a great help for me, but i never posted myself. So please excuse me, if i won't stick to every formality here perfectly. I will do my best. I hope it's ok that i have 3 different questions on one plot.

I try to create a surface plot by means of \addplots3[surf] and a coordinate table of the form x y z. Whereas x is a more or less continous variable, y contains only 10 columns representing 10 different functions of x. z is nothing but an intensity which i want to display via a color map.

My source code is the following

 \documentclass{article}
\usepackage{pgfplots}
\usepackage{tikz}
\pagestyle{empty}

%data are of the form
%
%282.7  1   0.0007976728
%282.7  2   0.0007010106
%282.7  3   0.0002862722
%282.7  4   0.0010733289
%282.7  5   0.0004453488
%282.7  6   0.0005347549
%282.7  7   0.0006696946
%282.7  8   0.0008733782
%282.7  9   0.0005243997
%282.7  10  0.0005450571
%282.740201005  1   0.0008267864
%282.740201005  2   0.0007236548
%282.740201005  3   0.0002901354
%282.740201005  4   0.0011133781
%282.740201005  5   0.0004554805
%282.740201005  6   0.0005512185
%282.740201005  7   0.0006887026
%282.740201005  8   0.000905994
%282.740201005  9   0.0005406747
%282.740201005  10  0.0005593566
%...

\begin{document}

\begin{tikzpicture}
\begin{axis}
[
view={0}{90},
colormap/bluered,
minor x tick num=3,
xmin=283.8,
xmax=289.3,
minor y tick num=0,
ymin=0,
ymax=11,
colorbar
]
\end{axis}
\end{tikzpicture}

\end{document}


Whereas the output is this:

As one can see the plot displays only 9 of 10 columns. Can someone see a reason for that?

Now, the colormap ranges from 0 to about 0.28 just as the data do, but somehow the colors of the plot only reach to about 0.16 (yellow). Does pgfplots perform kind of a binning so that peak values of greater than 0.2 are averaged to lower values? Or did i miss something else? And most important: how to get rid of it?

Last but not least: As i said before, the x-axis is continious, whearas y is not. Is there a way of interpolating the data along the x-axis in order to obtain a smoother curve, but not along the y-axis at the same time? shader=interp interpolates in both directions.