# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.325177        0.00792618    
     0.460000          0.700000          0.347870        0.00802748    
     0.700000           1.00000          0.159140         0.0111510    
      1.00000           1.54000          0.201076         0.0121747    
      1.54000           2.40000          0.358762         0.0144499    
      2.40000           4.80000          0.272000         0.0132761    
      4.80000           10.0000          0.161223         0.0135796