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1 Introduction
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2 The long-term evolution of AR 7978
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3 Magnetic helicity
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4 Injection of magnetic helicity
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5 Magnetic helicity in the corona
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6 Magnetic helicity of interplanetary clouds
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7 Magnetic helicity budget in AR 7978
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8 Conclusion
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Appendix A: Magnetic helicity of flux tubes in the convective zone
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References
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