# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0733761        0.00346855    
     0.460000          0.700000         0.0903083        0.00310136    
     0.700000           1.00000          0.101667        0.00402475    
      1.00000           1.54000          0.109123        0.00369043    
      1.54000           2.40000          0.105120        0.00424015    
      2.40000           4.80000         0.0973568        0.00437105    
      4.80000           10.0000         0.0954484        0.00670852