Advice sought: The section, 3d grid plots, is tricky:
example-{4,5,6}.png are not reprocible using the code in the file. I am
not sure they can even be produced using org-plot and gnuplot as each
exists now, without some drastic surgery. For example, to produce a
facsimile of example-5.png, I need something like

#+name: org-mode-figure.gnuplot
#+header: :var table=org-plot-org-mode-table
#+begin_src gnuplot :exports none :results none
unset key
set xrange [0:16]
set yrange [0:13]
plot table matrix with image title 'org mode'
#+end_src

where `org-plot-org-mode-table' is the un-named table that occurs after
these figures. Of course, that does not exercise the features of
org-plot that are intended.

To produce something like example-{4,5}.png, I can do the following (set
view 15,30 for example-4). But, this example seems like an excursion
into gnuplot coding. And, again, I am not using "type:grid", despite the
name of the section.

#+NAME: org-plot-org-mode-table
#+PLOT:  type:3d with:"pm3d" title:"org mode"
#+PLOT:  set:"pm3d corners2color mean interpolate 0,0"
#+PLOT:  set:"view 0,0; unset colorbox"
#+PLOT:  set:"object 1 rectangle from screen 0, screen 0 to screen 1, screen 1 fc rgb 'black' fillstyle solid 1.0"
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 0 | 0 | 1 | 1 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 0 | 0 |
| 0 | 1 | 0 | 0 | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 1 | 0 |
| 0 | 1 | 0 | 0 | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 1 | 0 |
| 0 | 1 | 0 | 0 | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 1 | 1 | 0 |
| 0 | 1 | 0 | 0 | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 |
| 0 | 1 | 0 | 0 | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 |
| 0 | 1 | 0 | 0 | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 1 | 0 |
| 0 | 1 | 0 | 0 | 1 | 0 | 1 | 1 | 0 | 1 | 0 | 1 | 0 | 0 | 0 | 1 | 0 |
| 0 | 0 | 1 | 1 | 0 | 0 | 1 | 0 | 1 | 1 | 0 | 0 | 1 | 1 | 1 | 0 | 0 |
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |


Leo