Two nonconducting infinite plane sheets having charges Q and 2Q are placed parallel to each other as shown in figure. The charge  distribution on the four faces of the two plates is also shown. The electric field intensities at three points 1, 2, and 3 are E1,  E2  and  E3, respectively. Then the magnitudes of E1,  E2  and  E3  are, respectively (surface area of plates)