Graphical representation of the four pistons (top) and the four modes (bottom). The four telescopes are represented as four pixels per square. Grey zones denote the zero-positions, black zones denote positive displacement, and white zones equal negative displacement. The modes could for example be labeled as tilt, twist, tip, and global piston. They form an equivalent to Zernike modes in AO, but for a four-telescope interferometer.
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