How to pause until plot window closed?

I want a shell script to plot a file and then allow the user to
manipulate the plot using the mouse (zoom, unzoom, etc.), and I
can't figure out how to do that.

  gnuplot <<EOF
  plot "$$tmp.dat" with points
  pause -1
  EOF

That exits immediately.

If I replace the -1 with a large number (say, 9999), then the
plot window is unresponsive.   If I do a "pause mouse key", then
the plot window closes when the user tries to un-zoom.  If I do
"gnuplot -persist" zooming with the mouse doesn't work.

How do I wait until the plot window closes?

Alternatively, how do I just pause forever so that the user can
kill the process with a SIGINT when he's done?

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