where the summation is over the all pore water pairs and the average over all conformations. In each case, residue #1769 is the solvent and Residue #1770 is the membrane. The projection axis is oriented downwards, such that positive (negative) projected fields indicated that the underlying electric field points down (up). The data is averaged over fifty 250 ps production MD trajectories, with a printout every 1 ps, for a total of 12.5 ns.