# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0110353        0.00950297    
     0.460000          0.700000         0.0160892        0.00391468    
     0.700000           1.00000         0.0165668        0.00355734    
      1.00000           1.54000         0.0188114        0.00285648    
      1.54000           2.40000         0.0168225        0.00371947    
      2.40000           4.80000         0.0191152        0.00466704    
      4.80000           10.0000         0.0174023        0.00798351