Cannot change gridlinestyle from solid gray. Tried 30+ Octave help webpages.

[rmt1]

Project: creating a topological map using contourf.
Problem: When I use 'grid on' I get a grid of appropriate size that is solid
gray lines.

I am able to get lines of chosen width with
set(get(gcf,'children'), 'linewidth', .2)

I am not able to get chosen style with
octave:165> set((get(gcf,'children')),'gridlinestyle','--')
no matter if it's :, -, -., --

I also haven't been able to change gridline colors.

It has been solid gray lines no matter what change of settings I've made,
but I want black dotted lines.



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