We've been reproducing the hybrid thermoforce coupling we've seen in a few 
papers for AdRess, and we came to wonder about the thermoforce precoupling 
factor. 

According to the votca documentation, eq 7.4, this is 1/(\rho^2*k_t). 
The value in the tutorials in votca, the value of 0.01382 for spc. 
When we've tried to calculate this value, we come up with 1.26 in internal 
gromacs units, which we believe to be kJ * nm^3 * mol^-1, derived from the 
pressure units of gromacs of kJ/mol/nm^3, and k_t being the compressibility 
of 4.5 * 10^-5 / bar.

Which units were used in deriving the value of 0.01382? Are we using the 
correct value for k_t?

Regards,
Alex Peyser

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