# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0187091         0.0183198    
     0.460000           1.00000         0.0245225        0.00748701    
      1.00000           1.54000        0.00536723         0.0226620    
      1.54000           2.40000         0.0398024         0.0134175    
      2.40000           4.80000         0.0257515         0.0209660    
      4.80000           10.0000         0.0202003         0.0348110