PolarTicks

is an option for sector charts and polar plots that specifies tick marks for polar axes.

Details

The following settings can be given for PolarTicks:
None no polar tick marks drawn

Automatic polar tick marks placed automatically

{θticks,rticks} separate specifications for angular and radial ticks
With the Automatic setting, tick marks are usually placed at points whose coordinates have the minimum number of digits in their decimal representation.
For each axis, the following tick mark options can be given:

	None	no tick marks drawn
	Automatic	tick mark positions and labels chosen automatically
	{t₁,t₂,…}	tick marks drawn at the specified positions
	{{t₁,label₁},{t₂,label₂},…}	tick marks drawn with the specified labels
	{{t₁,label₁,len₁},…}	tick marks with specified scaled length
	{{t₁,label₁,{plen₁,mlen₁}},…}	tick marks with specified lengths in the positive and negative directions
	{{t₁,label₁,len₁,style₁},…}	tick marks with specified styles
	func	a function to be applied to t_min, t_max to get the tick mark specification

For the angular ticks the following symbolic names can be given: "Degrees", "Radians", "Percent".
If no explicit labels are given, the tick mark labels are given as the numerical values of the tick mark positions.
Any expression can be given as a tick mark label.
Tick mark lengths are given as a fraction of the distance across the whole plot.
Tick mark styles can involve any graphics directives.
The tick mark function func[t_min,t_max] may return any other tick mark option.