point styles not as advertised on mac

[Hans Fugal]

I have Octave 3.0.2 on OS X from Macports (tried to upgrade to 3.0.3 but
had a compile error which I'll submit to the macports guys), gnuplot
4.2.3 (also from macports, and using aquaterm as the default terminal).
Plot point styles don't always match up.

plot(x,'-') works fine
plot(x,'.') works fine
plot(x,'^') plots with asterisks, not impulses (as help says) nor
triangles (as apparently is the correct behavior?)
plot(x,'@NM') where 1 <= M <= 6 doesn't set the point style but the
point color (disregarding N)
plot(x,'+') works fine
plot(x,'*') works fine
plot(x,'o') plots triangles instead of circles
stem(x) plots impulses with triangles instead of impulses with circles.
plot(x,'x') works fine


-- 
Hans Fugal ; http://hans.fugal.net

There's nothing remarkable about it. All one has to do is hit the
right keys at the right time and the instrument plays itself.
    -- Johann Sebastian Bach