On Fri, 11 Sep 2015, Sven Schreiber wrote:

 the common problem (with known solution) is to tell gnuplot to use only
 a single y-axis.
 But now (and amazingly for the first time in all those years,
 apparently) I have the opposite problem: I want to distribute the
 plotted lines to two separate y-axes, but gnuplot (or rather its gretl
 interface) won't let me do it. What can I do?

Gretl doesn't support this as an option to the "gnuplot" (or "plot") 
command, but it's easy enough in gnuplot. Example:

* Open data9-7 and ask for a time-series plot of PRIME and UNEMP (by 
default these use a single y-axis).

* In the plot window, right-click and choose "Save to session as 
icon".

* Right click on the resulting plot icon and choose "Edit plot 
commands".

* In the commands, insert the lines

set ytics nomirror
set y2tics

before the actual "plot" command.

* Within the "plot" lines, insert (before the "title" spec in each 
case):

axes x1y1 # for PRIME
axes x1y2 # for UNEMP

* Optionally, change the titles to "PRIME (left)" and "UNEMP 
(right)". So you've got:

'-' using 1:($2) axes x1y1 title "PRIME (left)" w lines , \
'-' using 1:($2) axes x1y2 title "UNEMP (right)" w lines

* Save the plot specification.

Allin

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