# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.166796        0.00470434    
     0.460000          0.700000          0.175706        0.00492011    
     0.700000           1.00000          0.193321        0.00628538    
      1.00000           1.54000          0.279263         0.0100284    
      1.54000           2.40000          0.295902         0.0144826    
      2.40000           10.0000          0.288212         0.0209703