Atomic fluctuations of Trp-Cage backbone atoms in two solvent environments. The numbering of atoms on the x-axis proceeds as (residue 1) N, CA, C, (residue 2) N, CA, C,…, (residue 20) N, CA, C. Fluctuations for simulations with sequences of 105, 106, and an infinite number of Langevin forces are shown as the blue, orange, and black lines, respectively. Error bars are given in the same colors as partially transparent regions surrounding each line. Simulations in explicit solvent were run for 36 ns, and simulations in implicit solvent were run for 200 ns. Note that the y-axis has a different scale in each panel.