# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0653526        0.00228169    
     0.460000          0.700000         0.0556838        0.00193891    
     0.700000           1.00000         0.0448685        0.00219543    
      1.00000           1.54000         0.0438630        0.00220900    
      1.54000           2.40000         0.0506868        0.00265040    
      2.40000           4.80000         0.0575829        0.00346527    
      4.80000           10.0000         0.0634506        0.00466118