# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0395636        0.00533860    
     0.460000          0.700000         0.0356958        0.00507956    
     0.700000           1.00000         0.0310439        0.00601542    
      1.00000           1.54000         0.0470574        0.00492606    
      1.54000           2.40000         0.0576950        0.00831830    
      2.40000           4.80000         0.0253877         0.0189337    
      4.80000           10.0000         0.0870787         0.0235195