[pstricks] tranparency with psdataplot, psfileplot and pslistplot

[$naKe]

Hi,

> are you looking for something  like this?
 >
 > http://tug.org/PSTricks/main.cgi?file=pst-plot/DataExamples#specialplot

definitely something that looks like that. Isn't there a more proper way
to do it with many points (>1000) with dots all having the same size ?

> If not provide a _complete_  example including a small data set

I am trying to do something like this:

\def\xmin{3700}
\def\ymin{31}
\def\xmax{9400}
\def\ymax{103}
\def\dx{2500}
\def\dy{25}
\def\al{0.007133}
\def\be{13.76}
\begin{pspicture}
\begin{psgraph}[Ox=\xmin,Oy=\ymin,Dx=\dx,Dy=\dy](\xmin,\ymin)(\xmax,\ymax){5cm}{5cm}
\psfileplot[plotstyle=dots,dotscale=.5,linecolor=blue,strokeopacity=.2]{data.dat}
\psplot[algebraic,plotpoints=2]{\xmin}{\xmax}{\al*x+\be}
\end{psgraph}
\end{pspicture}

where the data set can be found at

https://www.ceremade.dauphine.fr/~raguet/data.dat .

Sorry for compilation time (5871 points), but I guess data size matters 
here.

best,

Hugo

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