Untested advice: try changing 
"splot '-' using 4:3:5\n"

[download]
to 
"splot '-' using 4:3:5:1 with points pointsize variable\n"

[download]
or 
"splot '-' using 4:3:5:(2*$1) with points pointsize variable\n"

[download]

In reply to Re^2: Earthquakes in three dimensions by ambrus
in thread Earthquakes in three dimensions by snowhare

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