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. 2017 Jul 3;149(7):689–701. doi: 10.1085/jgp.201611744

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© 2017 Astakhova et al.

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Figure 10. — Correction of the recordings for slow irregularities of the base line. Curve 1 is a stretch of an original recording low-pass filtered at 3 Hz to more clearly show discrete dark events. Curve 2, two discrete dark events marked with vertical lines are cut-off from the curve 1 leaving continuous noise. The smooth line through 2 is the best-fitting third-order polynomial representing the baseline drift. Curve 3 shows the original record filtered at 10 Hz and corrected for base line irregularity. The curves are separated vertically to facilitate comparison.