# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0389239        0.00479365    
     0.460000          0.700000         0.0550477        0.00637533    
     0.700000           1.00000         0.0792438        0.00918486    
      1.00000           1.54000          0.133524         0.0131121    
      1.54000           2.40000          0.125175         0.0217913    
      2.40000           4.80000          0.208201         0.0368364    
      4.80000           10.0000          0.368792         0.0650470