Many thanks, it worked with this additional change.
I'm not sure whether I was supposed to expect problems when trying to
run Octave-2.9.12 from an xterm window in X11. So I've tried and it
worked just fine, i.e. the AquaTerm window had the correct title
number x as per figure (x) command used. I checked that the
../2.9.12/m/plot.drawnow.m which had been amended in two steps was
being used.
My ~.gnuplot does not set aqua it only contains 'set mouse' and 'set
loadpath ="....."'.
My ~.bash_profile, does contain 'export GNUTERM=aqua' and 'export
DISPLAY=:0.0'. However, this may not be relevant for X11?
I have checked my ~.xinitrc but could not find anything of relevance
in it as far as I can tell with my limited knowledge of such things.