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ValueErrorTraceback (most recent call last)
<ipython-input-1-e542a42896f9> in <module>()
     17     psd[ifo] = interpolate(data[ifo].psd(4), data[ifo].delta_f)
     18     psd[ifo] = inverse_spectrum_truncation(psd[ifo], 4 * data[ifo].sample_rate,
---> 19                                            low_frequency_cutoff=15.0)
     20 
     21 # Create a whitened version of the data for plotting

/srv/conda/envs/kernel/lib/python2.7/site-packages/pycbc/psd/estimate.pyc in inverse_spectrum_truncation(psd, max_filter_len, low_frequency_cutoff, trunc_method)
    218     # sanity checks
    219     if type(max_filter_len) is not int or max_filter_len <= 0:
--> 220         raise ValueError('max_filter_len must be a positive integer')
    221     if low_frequency_cutoff is not None and \
    222             (low_frequency_cutoff < 0 or

ValueError: max_filter_len must be a positive integer