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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_null_snr(self):
 		""" 		Get the coherent Null SNR for each row in the table. 		"""

		null_snr_sq = self.get_coinc_snr()**2 - self.get_column('snr')**2
		null_snr_sq[null_snr_sq < 0] = 0.
		return null_snr_sq**(1./2.)