Re: rtics NOT starting on 0 degrees

I'm not sure whether you can do this directly. I assume you mean the ttics.
Although you can set a polar grid angle (check 'help grid') you can only start at multiples of 90 degrees. Check 'help theta'.
A workaround would be to draw the gridlines manually.
I hope this still helps somehow.
Best, Theo.

Try the following example:

### polar plot with grids
reset session
set size square
set angle degrees

set polar
set theta clockwise top
unset border
unset tics
unset raxis
unset key
set border polar
set ttics 11.25, 22.50 format ""
set rtics 10 scale 0 format ""
set grid rtics

set rrange[0:40]
# manually draw grid lines
do for [i=1:16] {
    set arrow i from 0,0 to polar (i*360/16+11.25),40 lw 0.5 dt 3 lc rgb "black" nohead
}

set samples 16
plot t/9 w lp pt 7 lc rgb "red"
### end of code



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