_A_d_d _P_o_i_n_t_s _t_o _a _P_l_o_t
	
	     points(x, y, pch="o", ...)
	
	_D_e_s_c_r_i_p_t_i_o_n:
	
	     points draws a sequence of points at the specified
	     coordinates.  The specified character(s) are plotted,
	     centred at the coordinates.
	
	     Graphical parameters are permitted as arguments to this
	     function.