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Deterministic components of (A) the parallel and (B) the perpendicular acceleration for 
(gradient direction), as a function of 
. Black dots show the experimental results, the red lines display fits according to 
and 
, respectively. (C) 
as a function of 
. The red line shows the fit 
. (D) 
as a function of 
. The red line shows the fit 
. Error bars indicate the 95% confidence interval on the values of 
and 
.
