_R_G_B _C_o_l_o_r _S_p_e_c_i_f_i_c_a_t_i_o_n
	
	     rgb(red, green, blue)
	
	_D_e_s_c_r_i_p_t_i_o_n:
	
	     This function creates ``colors'' corresponding to the
	     given intensities of the red, green and blue primaries
	     (the intensities must lie between zero and one).
	
	     The values returned by rgb can be used with a col=
	     specification in graphics functions or in par.
	
	_S_e_e _A_l_s_o:
	
	     rainbow, hsv, gray.