@Preben Alsholm 

I used your suggestion and it worked but produced a slight asymmetry in the cutoff of the peaks. I added grid=[200,200] and that anomaly disappeared.

Thanks for the help, much appreciated.

Omicron1

@Kitonum 

Thanks for the help, it worked.

I have to read up on 'view' and 'grid' settings.

Again.

Thanlks.

Omicron1