# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.750694         0.0146756    
     0.460000          0.700000          0.730938         0.0124952    
     0.700000           1.00000          0.690455         0.0146184    
      1.00000           1.54000          0.637794         0.0119740    
      1.54000           2.40000          0.487690         0.0104611    
      2.40000           4.80000          0.327585        0.00842377    
      4.80000           10.0000          0.229567        0.00793104