HIST2LIMITS returns the threshold for detecting saturation artifacts.
Saturation thresholds can be obtained from the histogram [1]. This
routine tries to obtain the saturation threshold in an automated way.
The routine was tested with the histograms of 528 recordings with
three respiratory channels each.
Reference(s):
[1] A. Schl�l, B. Kemp, T. Penzel, D. Kunz, S.-L. Himanen,A. V�ri, G. Dorffner, G. Pfurtscheller.
Quality Control of polysomnographic Sleep Data by Histogram and Entropy Analysis.
Clin. Neurophysiol. 1999, Dec; 110(12): 2165 - 2170.