pst-plot: x-y-data from different files

How do I plot with pst-plot when the x- and y- data are stored in different files?

\documentclass{scrartcl}
\usepackage[utf8]{inputenc}
\usepackage{pst-plot}
\usepackage{auto-pst-pdf}

\begin{document}

\begin{postscript}
\begin{psgraph}[axesstyle=frame](0,0)(25,7.5){10cm}{6cm}
\listplot{**What to do here?**}
\end{psgraph}
\end{postscript}

\end{document}


Inside PostScript you can do anything:

\readdata{\xData}{x.dat}
\def\DATA{
/X [\xData] def /Y [\yData] def % save as array
0 1 X length 1 sub {            % on stack is the loop variable
/Index ED                     % save it
X Index get Y Index get       % get x y
} for }                         % end for loop
\begin{psgraph}[axesstyle=frame,Dx=2](0,0)(25,7.5){10cm}{6cm}
\listplot{\DATA}
\end{psgraph}

• Dear Herbert, since I don't know how to contact you otherwise, I believe that there is a bug in the pst-plot manual. The command \psreadColumnData described on p. 5 probably should read \psreadDataColumn. +1 for the nice answer. – user121799 Feb 14 '18 at 1:52

Here's how you would do this with PGFPlots. You can make a column from a different table available using the copy column from table style.

\documentclass[border=5pt]{standalone}
\usepackage{pgfplots, pgfplotstable}
\usepackage{filecontents}

\begin{filecontents}{A.dat}
0
1
2
3
4
5
\end{filecontents}

\begin{filecontents}{B.dat}
0
1
4
9
16
25
\end{filecontents}

\pgfplotstableset{
create on use/y/.style={create col/copy column from table={B.dat}{0}}
}

\begin{document}

\begin{tikzpicture}
\begin{axis}