How many indexes can you have in an org-mode document exported to latex?
My experience shows 2! So how can I have 3, or more please?

This is the relevant part, I think, of my preamble of my file -

--8<---------------cut here---------------start------------->8---
#+latex_header: \usepackage{imakeidx}
#+latex_header: \makeindex[title=Index,options=-s ./index.ist,columnseprule,intoc]
#+latex_header: \makeindex[name=ps,title=Index of Symptoms,options=-s ./index.ist,columnseprule,intoc]
# #+latex_header: \makeindex[name=se,title=Index of Side-effects,options=-s ./index.ist,columnseprule,intoc]
--8<---------------cut here---------------end--------------->8---

I can have any choice of 2, but not 3 as I would like.

In a 'straight' latex file using the above commands I can have 3 or
more, so how do I get it to allow 3 or more in org-mode please?

Thanks
Sharon.
-- 
A taste of linux = http://www.sharons.org.uk
TGmeds = http://www.tgmeds.org.uk
Debian 8.4, fluxbox 1.3.7, emacs 25.0.95