# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0791323         0.0494517    
     0.460000           1.54000         0.0190808         0.0311712    
      1.54000           2.40000         0.0557383         0.0346742    
      2.40000           4.80000         0.0750910         0.0111585    
      4.80000           10.0000         0.0409710         0.0129502