where the sum runs over T=375 trajectory frames (we concatenate the last 125 frames out of 250 frames from each of the three repeats) with residue coordinate vector r t being either the Cα positions or the backbone bead positions and r is the mean coordinate vector over the concatenated 375 frames. To compare the coarse-grained fluctuations to the atomistic counterpart, we report the absolute error to the atomistic RMSF per residue: