Fig. 9.
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Time evolution of mean and minimum twist numbers 
, 
and the axial flux Φt in the main FR between 21 April 18:00 UT and 22 April 13:00 UT. The shaded region around the purple 
illustrates the 
range, σ(Tw) being the standard deviation of the Tw in the main FR. The vertical dashed line shows the initiation time of the observed eruption on 22 April 2013 at 08:40 UT.
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