# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.125063        0.00413063    
     0.460000          0.700000          0.126535        0.00383153    
     0.700000           1.00000          0.122287        0.00475791    
      1.00000           1.54000          0.122103        0.00510855    
      1.54000           2.40000          0.122866        0.00685805    
      2.40000           4.80000         0.0918848        0.00912575    
      4.80000           10.0000         0.0837399         0.0130371