Dear Rafael,
what you observe is most likely a side effect of the high-pass filter on
your design. However, you should not worry too much about the filtered
design not matching your data - the data will be filtered before
estimating your filtered design as well.
Hope this helps,
Volkmar
<https://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=ind0908&L=SPM&Y=volkmar.glauche%40uniklinik-freiburg.de&P=60785>
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