_A_d_d _C_o_n_n_e_c_t_e_d _L_i_n_e _S_e_g_m_e_n_t_s _t_o _a _P_l_o_t
	
	     lines(x, y, ...)
	
	_D_e_s_c_r_i_p_t_i_o_n:
	
	     lines takes the coordinates given in the x and y vec-
	     tors and joins those points with line segments.  The
	     coordinates can alternatively be passed to lines in a
	     plotting structure (a list with x and y components), a
	     time series, etc.
	
	     Graphical parameters can also be specified as argu-
	     ments.
	
	_E_x_a_m_p_l_e_s:
	
	     # draw a smooth line through a scatter plot
	     plot(cars, main="Stopping Distance versus Speed")
	     lines(lowess(cars))