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Stereo calibration

I have been trying stereo calibration. I have taken chessboard images from two different cameras. The cameras are kept on a level table. Single calibration of the two cameras is correct I think because they're the same mobile model and the focal length results are similar. But I have a doubt about the stereo calibration results because my translation vector is non zero in all three directions with big values. But they are just kept on a level table, side by side. z component of the translation vector should be zero, right?