# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0100377        0.00253827    
     0.460000          0.700000         0.0118458        0.00267201    
     0.700000           1.00000         0.0117357        0.00320072    
      1.00000           1.54000         0.0198333        0.00352433    
      1.54000           2.40000         0.0128728        0.00457782    
      2.40000           4.80000         0.0225239        0.00508229    
      4.80000           10.0000         0.0315717        0.00799446