[R] Colouring a grid segment

[darrenh65]

Hi,
I am attempting to create a polar chart (using plotrix polar.plt) and I need
to colour a segment of the grid to indicate an area of interest, say from
90-120 degrees, for arguments sake. Is this possible? I can colour the whole
grid by passing the grid.bg parameter through to radial.plot but I cannot
find a way to colour a segment.

thanks,
Darren
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