There is NO net electric charge inside the box, but the space in and around the box is filled with a nonuniform electric field of the following form: E(x, y,z) = c1z2i + c2xyj + c3x2k, where c1 = 4.35 N/(Cm2), c2 = 3.16 N/(Cm2), c3 = 5.55 N/(Cm2), are constants. What is the electric flux through the top face of the box? (Remember that we define positive flux pointing out of the box.)