The r.m.s. deviation of Zcalc(Q, t) of the model from that of the measured Zexp(Q, t) for the 20 tentative tyrosyl sites. Black filled circles are data from the two-dimensional Fourier analysis and red filled circles are data from the one-dimensional Fourier analysis. The lowest r.m.s. values are obtained with tyr-369 together with tyr-357 and tyr-324 as radical sites.