# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0424045        0.00150003    
     0.460000          0.700000         0.0661381        0.00181869    
     0.700000           1.00000         0.0716818        0.00209543    
      1.00000           1.54000         0.0881120        0.00245854    
      1.54000           2.40000          0.107861        0.00367801    
      2.40000           4.80000          0.106618        0.00526525    
      4.80000           10.0000          0.138233        0.00844962