Update default fLow to 20 Hz in line with comment in example ini file
The example ini file comments say 20 Hz is the default low frequency cutoff, but the code is still set to 40Hz. This updates the code to be more in line for Advanced detectors.
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The example ini file comments say 20 Hz is the default low frequency cutoff, but the code is still set to 40Hz. This updates the code to be more in line for Advanced detectors.