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Beam coverage with rotations. The P-RSBT shield consists of four paddles each with a size of 90°. The size of a beamlet is 30°. Each beamlet bj,k covers a sector sj,k. While opening a paddle forms a beam which can cover multiple sectors. The sector sj,0 is covered by the beams formed with paddle 0 open (a) and with paddle 3 open after a rotation of degree 30° (b) and a rotation of degree 60° (c).
