# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000           1.00000         0.0158208        0.00566192    
      1.00000           1.54000         0.0234145         0.0116006    
      1.54000           2.40000         0.0479013         0.0119527    
      2.40000           4.80000         0.0332653         0.0189690    
      4.80000           10.0000        0.00373058         0.0480661