Thanks to @jwinter
for a most interesting submission.
Something very different from normal and it got me intrigued.
Although I was trained as a "scientist" in my younger days, astronomy has its own jargon which takes some understanding.
Accordingly, I struggled to find FITS data on the Web in an understandable manner but eventually succeeded. If you can point me in the direction of some particularly interesting FITS data (for example the star Mira comes to mind) I would be grateful.
In the course of my efforts I came across another program which seemed to offer even more functionality ...SAOImage DS9 V 5.7
It requires no installation and given that versions are around for Linux and Mac is likely to be portable.
Be interested in your opinion.
Once again, thanks for your valuable submission.