# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0736865        0.00227158    
     0.460000          0.700000         0.0732107        0.00183556    
     0.700000           1.00000         0.0774704        0.00220428    
      1.00000           1.54000         0.0973633        0.00255507    
      1.54000           2.40000          0.111457        0.00411410    
      2.40000           4.80000          0.124157        0.00693108    
      4.80000           10.0000          0.145789         0.0112340