# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0669529        0.00203298    
     0.460000          0.700000         0.0552898        0.00172739    
     0.700000           1.00000         0.0489262        0.00192204    
      1.00000           1.54000         0.0533078        0.00200822    
      1.54000           2.40000         0.0604718        0.00240801    
      2.40000           4.80000         0.0817562        0.00296756    
      4.80000           10.0000         0.0980778        0.00414179