# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000          0.116784        0.00868771    
     0.460000          0.700000          0.149019        0.00842092    
     0.700000           1.00000          0.137883         0.0102320    
      1.00000           1.54000          0.161373         0.0158733    
      1.54000           2.40000          0.205438         0.0298154    
      2.40000           4.80000          0.244645         0.0453684    
      4.80000           10.0000          0.308781          0.131636