J. Shift function

The experimental FDC measurements are force vs. trap position as measured by the light-levers. The unzipping/zipping curves contain reproducible and recognizable landmarks (i.e., slopes and rips) which indicate the true position of the trap. Therefore it is possible to to take advantage of these landmarks to correct for the instrumental drift. Correction for drift is introduced in terms of a shift function $ s(x_\mathrm{tot})$ which is built in several steps. Due to its relevance for data analysis we describe the steps in some detail:

Figure J.1: Fit of the shift function. (a) Steps 1 and 2. (b) Steps 2 and 3. (c) Step 4. (d) Steps 4 and 5. (e) Step 6. (f) Step 7. (g) Step 7.
\includegraphics[width=\textwidth]{figs/appendix5/shiftfunc.eps}

JM Huguet 2014-02-12