# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.152596        0.00555191    
     0.460000          0.700000          0.159345        0.00537524    
     0.700000           1.00000          0.178916        0.00616211    
      1.00000           1.54000          0.208426        0.00852640    
      1.54000           2.40000          0.267053         0.0141863    
      2.40000           4.80000          0.243189         0.0253941    
      4.80000           10.0000          0.387370         0.0682221