# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.229537        0.00364986    
     0.460000          0.700000          0.292571        0.00346242    
     0.700000           1.00000          0.490682        0.00594326    
      1.00000           1.54000          0.573860         0.0104847    
      1.54000           2.40000          0.544954         0.0521220    
      2.40000           10.0000          0.468753          0.269800