# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0127767        0.00189227    
     0.460000          0.700000         0.0227336        0.00155578    
     0.700000           1.00000         0.0242506        0.00157498    
      1.00000           1.54000         0.0201848        0.00159446    
      1.54000           2.40000         0.0218427        0.00191425    
      2.40000           4.80000         0.0276133        0.00225983    
      4.80000           10.0000         0.0263372        0.00378715