# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.264188        0.00142734    
     0.460000          0.700000          0.257633        0.00128515    
     0.700000           1.00000          0.243189        0.00157850    
      1.00000           1.54000          0.205856        0.00188879    
      1.54000           2.40000          0.180685        0.00254002    
      2.40000           4.80000          0.166462        0.00345944    
      4.80000           10.0000          0.144260        0.00551416