# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0652862        0.00708647    
     0.460000          0.700000         0.0576406        0.00703836    
     0.700000           1.00000         0.0783101        0.00833492    
      1.00000           1.54000         0.0645252        0.00945047    
      1.54000           2.40000         0.0610971         0.0122381    
      2.40000           10.0000         0.0500208         0.0177122