%    start time	      end time	      duration	      low freq	     high freq	
         31.055	         31.060	          0.005	      23379.823	      47544.837	
         31.263	         31.268	          0.005	      24041.878	      47793.108	
         31.468	         31.473	          0.005	      26276.315	      46468.997