# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000           1.00000        0.00462983        0.00511325    
      1.00000           1.54000         0.0133413        0.00780782    
      1.54000           2.40000         0.0316276        0.00489934    
      2.40000           4.80000         0.0350383        0.00303985    
      4.80000           10.0000         0.0203609        0.00245183