On Wednesday,  4 Oct 2017 at 09:12, Peter Davis wrote:

[...]

> Meanwhile, I have discovered a Google charting function which gives me
> an annotated time series graph that comes very close to what I
> need. Also, I’ve had no problems exporting many other documents to
> HTML and/or PDF. So I’m afraid solving this has dropped on my priority
> list.

Frustrating that you have not managed to get this working in Emacs with
org but I'm glad you found a solution to the real task.

-- 
: Eric S Fraga via Emacs 27.0.50, Org release_9.1.1-78-gfbf47c