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Figure 1.
Definition of 
. The solid black lines are the level curves of P (x). In 
∈ the unit vector 
in the direction of x1 is orthogonal to the tangent on the level curve trough .
. The solid black lines are the level curves of P (x). In ∈ the unit vector in the direction of x1 is orthogonal to the tangent on the level curve trough .
Lang et al. PMC Biophysics 2009 2:10 doi:10.1186/1757-5036-2-10
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