function small_polar_plot(xo,yo,rr)
%spplot-- make a small polar plot suitable for a multi-polar display.
%   spplot(x0,y0,rho) makes a polar plot centered at (x0,y0), with
%   radii rho.  The data points are assumed to be equally spaced around
%   the circle, starting at 0.

% construct the angles.
sz = size(rr);
if sz(1) == 1
	rr = rr';
	sz = size(rr);
end
theta = (0:sz(1)-1)'*2*pi/sz(1);

tpplot(xo,yo,rr,theta);
