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1 Introduction
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2 Effect on narrow emission lines
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3 Effect on other lines
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4 Effect of time dependence of the line intensity or variation of the
Lorentz factor
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5 Discussion and conclusions
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References
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Online Material
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Appendix A: Analytical study of
for very
narrow emission lines
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Appendix B: Expected flux of a fireball with a variable Lorentz factor
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Appendix C: Lower limit of the coefficient of deceleration
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