deletions | additions       diff --git a/Material_methods.tex b/Material_methods.tex  index a1b9106..280a0bb 100644  --- a/Material_methods.tex  +++ b/Material_methods.tex 
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Each sample was observed with a 5 MHz ultrasonic probe made of 128 elements (ATL L7-4, Philips, Amsterdam, Netherlands) coupled to a Verasonics scanner (Verasonics V-1, Redmond, WA, USA). The probe was in contact with the sample with an ultrasound coupling gel but was fixed on a third independent support. It was used in ultrafast mode \cite{bercoff2004supersonic}, to acquire 1000 frames per second using plane waves and Stolt's fk migration algorithm \cite{garcia2013stolt}. The Z component of the displacement in the sample was observed by performing cross-correlations between radiofrequency images with a speckle-tracking technique \cite{montagnon2012real}. The TMS electrical current burst was triggered 10 ms after the beginning of the ultrasound frame acquisition, and the time $t$ = 0 ms was defined as the trigger emission.  Great care was taken to ensure that the three supports were not in contact and fixed separately. It could ensure that any vibration of one of them could not be transmitted to the sample, leading to displacement artifacts.