Hello Vitaly--

> 
> I have a couple more questions on this potential: does the thickness
> parameter refer to the length of the bilayer, or one of the
> monolayers? 

If z=0 is the center of the membrane, z=T/2 is a surface boundary. 

> Also, does the switching function acts outside the
> "thickness" parameter, or somewhere before that? For example, if
> thickness is set to 20 A, does the "polarity" profile remain constant
> at [0-20] A or at some [0-N] range?

The switching function is

f(z) = z'^n / (1 + z'^n)

where z' = 2 |z| / T

It is based on Lazaridis, Proteins 52, 176 (2003).

Charles
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