FIGURE 7.

(A) SNR is inversely proportional to the square-root of the measurement bandwidth f_LP, and proportional to Simulated step detection threshold contours (SNR = 4) as a function of F_C for stepping rates between 10 s⁻¹ and 1000 s⁻¹, and (B) for persistence lengths between 1 nm and 100 nm. Contours for three step lengths are shown, ΔL = 0.3 nm (triangles), ΔL = 0.9 nm (squares), and ΔL = 1.5 nm (circles). Solid lines indicate step detection thresholds calculated from the exact formula, Eq. 10, and dashed lines indicate the SNR threshold calculated from the approximate formula, Eq. 25. L = 1000 nm, d = 1000 nm, in (A) L_p = 50 nm, and in (B) k_cat = 100 s⁻¹. In panel B, the dotted line indicates the border between the high-force (III) and the medium-force (II) regions.