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1 Introduction
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2 The nebula
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3 The observational material and the reduction technique
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4 The gas kinematics
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5 The physical conditions
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6 The radial ionization structure
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7 The nebular distance, mass and age
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8 The central star
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9 The photo-ionization model
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10 The 3-D morpho-kinematical structure
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11 Discussion and concluding remarks
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References
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