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(A) Potential energy, U(x,y), of the model system
with Hy = 6 in eq 16. (B) The one-dimensional
PMF, 
, calculated from U(x,y) (black) and the results of 120-ns
simulation data from USMD (red), WEUSMD (green), and aWEUSMD (blue)
with N = 31 windows. 
from U(x,y) is calculated by eq 1 and
those from simulations are calculated by WHAM.
